Literature DB >> 35164224

Pentacyclic Triterpenoids Isolated from Celastraceae: A Focus in the 13C-NMR Data.

Karen Caroline Camargo1, Mariana Guerra de Aguilar1, Acácio Raphael Aguiar Moraes1, Raquel Goes de Castro1, Daiane Szczerbowski1, Elizabeth Luciana Marinho Miguel1, Leila Renan Oliveira1, Grasiely Faria Sousa1, Diogo Montes Vidal1, Lucienir Pains Duarte1.   

Abstract

The Celastraceae family comprises about 96 genera and more than 1.350 species, occurring mainly in tropical and subtropical regions of the world. The species of this family stand out as important plant sources of triterpenes, both in terms of abundance and structural diversity. Triterpenoids found in Celastraceae species display mainly lupane, ursane, oleanane, and friedelane skeletons, exhibiting a wide range of biological activities such as antiviral, antimicrobial, analgesic, anti-inflammatory, and cytotoxic against various tumor cell lines. This review aimed to document all triterpenes isolated from different botanical parts of species of the Celastraceae family covering 2001 to 2021. Furthermore, a compilation of their 13C-NMR data was carried out to help characterize compounds in future investigations. A total of 504 pentacyclic triterpenes were compiled and distinguished as 29 aromatic, 50 dimers, 103 friedelanes, 89 lupanes, 102 oleananes, 22 quinonemethides, 88 ursanes and 21 classified as others.

Entities:  

Keywords:  13C-NMR; Celastraceae; quinonemethide; triterpenes

Mesh:

Substances:

Year:  2022        PMID: 35164224      PMCID: PMC8838773          DOI: 10.3390/molecules27030959

Source DB:  PubMed          Journal:  Molecules        ISSN: 1420-3049            Impact factor:   4.411


1. Introduction

The Celastraceae family comprises approximately 96 genera, reaching about 1350 species distributed in the tropical and subtropical regions of the world [1,2]. Species of this family stand out for producing compounds with several pharmacological activities, such as antitumor [3,4], anti-inflammatory [5], antimicrobial [6,7,8], antioxidant [9] antiviral [10], analgesic [5,11], antiulcerogenic [12], hepatoprotective [13], hypoglycemic [13,14], immunomodulatory [15], among others. Considering the chemical composition, species of the Celastraceae family are rich in pentacyclic triterpenes (PCTTs). PCTTs show a range of biological properties, characterizing these plants as research targets aiming to obtain new bioactive compounds or prototypes of new drugs [16,17,18,19,20,21,22]. PCTTs are structurally diverse compounds and are therefore classified according to their main skeletal structure. The main classes found in Celastraceae family possess friedelane, oleanane, lupane, ursane and quinonemethide skeletons. Quinonemethides are chemomarkers of this family are found exclusively in these species [13]. These PCTTs can occur as alcohols, ketones, carboxylic acids, lactones, aldehydes, epoxides, esters, or even glycosylated derivatives. Furthermore, these PCTTs can be sub-classified as seco, generally due to the opening of one of their rings, the most common being the ring ‘A’ opening between carbons 3 and 4, and sub-classified as nor when there is a lack of any of the methyl groups that constitute the basic skeleton. This review aims to present the PCTTs reported for species of the Celastraceae family in the 21st century, exhibiting from which species they were isolated and contributing to the chemical characterization process of these compounds listing their 13C NMR data. The information about the PCTTs was obtained from SciFinder, Scopus, and Web of Science, using as key search terms: “Celastraceae and triterpenes”, “Celastraceae and compounds”, “Celastraceae and phytochemistry” and “Celastraceae and metabolites”. Articles with only ethnopharmacological information and data from in vitro and in vivo tests involving extracts or isolated substances were excluded. The period covering from January 2001 to September 2021 was considered since the group has already developed a free online database (in Portuguese) for the previous years [23]. This review reports a total of 504 pentacyclic triterpenoids, 29 aromatics (A), 50 dimers (D), 103 friedelanes (F), 89 lupanes (L), 102 oleananes (O), 22 quinonemethides (Q), 88 ursanes (U) and 21 classified as others. Table S1 (Supplementary Material) summarizes all these PCTTs, as well as the plant species and parts from which they were isolated.

2. Pentacyclic Triterpenoids (PCTTs)

PCTTs consist of 30 carbon atoms (six isoprene units) distributed over five fused rings (named A, B, C, D and E). This ring arrangement yields five six-membered rings or four six-membered rings fused to a 5-membered ring, numbered as shown in Figure 1 [24].
Figure 1

Core rings A, B, C, D, and E found in PCTTs.

As terpenes, the biosynthesis of PCTTs starts by the coupling of active isoprene units. Initially, there is an electrophilic condensation of IPP (isopentenyl diphosphate), with DMAPP (dimethylallyl diphosphate), yielding the precursor of monoterpenes, geranyl diphosphate (GPP). The addition of IPP to GPP generates farnesyl diphosphate (FPP), which is the precursor of sesquiterpenes. Then a tail-tail condensation of two FPP molecules leads to squalene, after the release of a diphosphate unit and a 1,3-alkyl shift (Figure 2) [25].
Figure 2

Simplified biosynthetic route of 2,3−oxidosqualene, the direct precursor of triterpenes, from isoprene. DMAPP: dimethylallyl diphosphate; IPP: isopentenyl diphosphate; GPP: geranyl diphosphate; FPP: farnesyl diphosphate; PP: diphosphate [26,28].

The biosynthesis of PCTTs continues with the oxidation of squalene, catalyzed by squalene epoxidase, forming 2,3-oxidosqualene. This intermediary assumes the “chair-chair-chair-boat” conformation and after a sequence of cyclizations yields the dammarenyl cation, which then undergoes a rearrangement forming the baccharenyl cation. From the baccharenyl cation, the key step in PCTTs biosynthesis occurs, characterized by the formation of the lupanyl cation (Figure 3) [25,26]. Through a sequence of carbocation rearrangements (1,2-shifts), involving hydride, methyl, and ring-opening shifts, the lupanyl cation yields the different PCTTs skeletons, which then could oxidize, reduce, and isomerize, leading to the formation of the different currently known PCTTs [25,26].
Figure 3

Simplified terpenoid biosynthetic route for the formation of the main pentacyclic triterpene skeletons isolated from Celastraceae species. “a” and “b” indicate two possible biosynthetic pathways [26,28].

The most powerful spectroscopic method in the structural elucidation of PCTTs is 13C Nuclear Magnetic Resonance (NMR). Comparison of experimental 13C NMR chemical shifts with literature data is a useful tool in identifying the basic skeleton of these compounds. Through this data, it is possible to make predictions about the influence of a functional group on the chemical displacement of carbons from its basic skeleton [27]. According to Mahato & Kundu [27], for example, the introduction of a hydroxyl group in the PCTT structure induces a deshielding of about 34–50 ppm of the α carbon, 2–10 ppm of the β carbons and 0–9 ppm of the γ carbons. The effect of the hydroxyl presence on the 13C NMR chemical shift of the α-carbon, is related to its configuration, and with the number of γ-gauche-type, and 1,3-diaxial-type interactions with the carbon atoms of the triterpene skeleton [27]. Simplified biosynthetic route of 2,3−oxidosqualene, the direct precursor of triterpenes, from isoprene. DMAPP: dimethylallyl diphosphate; IPP: isopentenyl diphosphate; GPP: geranyl diphosphate; FPP: farnesyl diphosphate; PP: diphosphate [26,28]. Simplified terpenoid biosynthetic route for the formation of the main pentacyclic triterpene skeletons isolated from Celastraceae species. “a” and “b” indicate two possible biosynthetic pathways [26,28].

2.1. Friedelanes

Compounds presenting a friedelane skeleton, together with the oleananes, are the most abundant PCTTs in the Celastraceae family, being found in the leaves, branches, roots and other parts of these plants [13]. These systems are formed by five six-membered rings fused. Rings A/B, B/C and C/D have trans configuration (H-10α and H-8α), while ring D/E is cis (H-18β). They have eight methyl groups; six attached to distinct carbons, at positions 4 (Me 23β), 5 (Me 24β), 9 (Me 25β), 13 (Me 27α), 14 (Me 26β) and 17 (Me 28β), and two geminal methyl groups at carbon 20 (Me 29α and 30β) [22,29]. In this work, 103 PCTTs of friedelan skeleton (F) are reported, compounds F1–F103 (Figure 4).
Figure 4

Structures of friedelane-type pentacyclic isolated from Celastraceae species (2001–2021). (a) Compounds F1−F8, F10, F11, F13−F15, F18−F22, F26, F33−F35, F46, F49, F54, F73, F80, F82−F87, F89, F90, F93 and F94. (b) Compounds F9, F12, F16, F17, F24, F25, F28−F32, F37, F40−F42, F47, F48, F50, F51, F63, F65−F68, F71, F72, F74, F76, F78 and F92. (c) Compounds F27, F36, F39, F43, F52, F53, F56, F57, F58−F62, F64, F69, F70, F75, F77, F79, F81, F88, F91 and F99. (d) Compounds F23, F38, F44, F45, F55, F95−F98, F100−F103.

An important observation in the 13C NMR data of 3-oxo friedelanes is the shielding of methyl group 23, which has a chemical shift value around δC 7.0 ppm. This occurs since this methyl is found in a cone region, generated by the π electrons of the carbonyl group at C-3, which promotes a region of shielding magnetic anisotropy [30].

2.2. Quinonemethides and Aromatics

Quinonemethides are compounds isolated exclusively in species of the Celastraceae family, and can also be found in the form of dimers or trimers [31]. Hypotheses about their origin assume that they are formed from friedelane derivatives, which are transported from the leaves to the roots, where they are converted into quinonemethides [32]. They are characterized as 24-nor-triterpenoids, due to the absence of methyl 24, and also they have functional oxygenated groups attached to carbons 2 and 3 [33]. Aromatic skeleton PCTTs are a subgroup of quinonemethides, which are characterized by the aromaticity of the A ring. Between 2001 and 2021 about 22 quinonemethides (Q), Q1–Q22 (Figure 5), and 29 aromatics analogues (A), A1–A29 (Figure 6) were isolated from Celastraceae species.
Figure 5

Structures of quinonemethide-type pentacyclic triterpenoids isolated from Celastraceae species (2001–2021).

Figure 6

Structures of aromatic-type pentacyclic triterpenoids isolated from Celastraceae species (2001–2021).

In the 13C NMR spectra of the quinonemethides, signals are observed in the characteristic carbonyl region, between δC 170–200 ppm, and in the typical olefinic carbon region, around δC 110–160 ppm.

2.3. Dimers

Dimers are formed from PCTTs of the quinonemethide class and its aromatic derivatives, therefore they are also restricted to the Celastraceae family. According to Bazzocchi, Núñez and Reyes [31], these triterpenes are possibly biosynthesized through a Diels-Alder reaction, in which the different possible orientations of the monomers during the reaction result in a variety of isomers. Between the years 2001 and 2021, 50 dimers (D), D1–D50, were reported (Figure 7). Most of these dimers are formed by two triterpenes with quinonemethide skeleton or their aromatic derivatives. However, the formation of adducts can also occur from the combination of a triterpene and a sesquiterpene (D15–D24; D37–D38).
Figure 7

Structures of dimer-type pentacyclic triterpenoids isolated from Celastraceae species (2001–2021). (a) Compounds D1–D14. (b) Compounds D15–D26, D37, D38 and D40–D47. (c) Compounds D27–D30 and D32–D36. (d) Compounds D31, D39 and D48–D50.

2.4. Lupanes

Unlike other skeletons, lupane-type PCTTs are formed by a trans pentacyclic ring system, in which the E ring is five-membered with an isopropenyl α substituent at carbon 19, containing a double bond between carbons 20 and 29 [19,22]. They have seven methyl groups, with two geminal ones attached to carbon 4 (Me 23α and 24β) and the others attached to carbon 8 (Me 26β), 10 (Me 25β), 14 (Me 27α), 17 (Me 28β), and 20 (Me 30), respectively. In this review, 89 pentacyclic triterpenoids of the lupane-type (L), L1–L89, were reported (Figure 8).
Figure 8

Structures of lupane-type pentacyclic triterpenoids isolated from Celastraceae species (2001–2021). (a) Compounds L1, L2, L4, L6, L7, L9, L10, L13, L15, L17, L19, L22, L28, L30, L33, L39, L40, L44, L49-L51, L56, L61, L67, L74–L77, L83, L84, L87 and L88. (b) Compounds L3, L5, L8, L11, L12, L14, L16, L18, L20, L21, L23–27, L31, L32, L34–L38, L41–L43, L45–L48, L52–L54, L57–L60, L62–L66, L68–L73, L78–L82 and L85. (c) Compounds L29, L55, L86 and L89.

Characteristic 13C-NMR signals of the class of lupanes are those in the olefinic region, which appear around δC 109 (C-29) and δC 150 ppm (C-20), and signals from the methine carbons C-5 (Hα), C- 9 (Hα), C-13 (Hβ), C-18 (Hα), and C-19 (Hβ), observed around δC 55, 50, 38, 48 and 47 ppm, respectively.

2.5. Oleananes

Oleanane-type triterpenoids are characterized by the presence of a double bond, most commonly between carbons 12 and 13. Rings A/B, B/C, and C/D have trans configuration, whereas rings D/E are cis. They have eight methyl groups. Geminal ones 23 (α) and 24 (β) are connected to carbon 4, and 29 (α) and 30 (β) to carbon 20. The others are connected to carbons 8 (Me 26β), 10 (Me 25β), 14 (Me 27α) and 17 (Me 28β) [19]. In this work, 102 pentacyclic triterpenoids with oleanane skeleton (O), O1–O102, were reported (Figure 9).
Figure 9

Structures of oleanane-type pentacyclic triterpenoids isolated from Celastraceae species (2001–2021). (a) Compounds O1–O10, O12–O15, O17, O25–O27, O29, O30, O33, O35, O36, O38, O39, O43, O46, O48, O50, O55, O57–O59, O63, O64, O66, O68, O70, O71, O73, O74, O76, O79–O82, O84–O87 and O89. (b) Compounds O11, O16, O18–O20, O22, O23, O28, O31, O32, O34, O37, O40–O42, O44, O47, O49, O51, O52, O54, O56, O60–O62, O65, O67, O69, O83, O88 and O90–O100. (c) Compounds O21, O24, O45, O53, O72, O75, O77, O78, O101, and O102.

In the 13C-NMR spectrum, the signals that characterize oleananes are those related to the double bond carbon atoms. For the most common oleananes with double bond between carbons 12 and 13, the chemical shifts are observed around δC 122 (C-12) and δC 145 ppm (C-13), except for those that have substituents close to these carbons [27].

2.6. Ursanes

Ursanes differ structurally from oleananes only by the position of methyl group 29, which is attached to carbon 19, in a β position. In the structure of ursanes, methyl group 30 is found in α position. Rings A/B, B/C and C/D have trans configuration, while rings D/E have cis configuration, like oleananes. The most common ursanes also present a double bond between carbons 12 and 13 [19]. There were 88 ursanes (U) isolated from Celastraceae species, triterpenoids U1 to U88, were reported (Figure 10).
Figure 10

Structures of ursane-type pentacyclic triterpenoids isolated from Celastraceae species (2001–2021). (a) Compounds U1, U4, U5, U8, U10, U12, U18, U22–U24, U34–42, U52–U55, U57, U64, U68–U73, U76–U78 and U84. (b) Compounds U2, U3, U6, U7, U9, U11, U13–U17, U19–U21, U25–U33, U43–U51, U56, U58–U63, U79–U83 and U85. (c) U65–U67, U74, U75, U86–U88.

13C-NMR spectrum of ursanes differ from the spectrum of oleananes by the chemical shift signals of the olefinic carbon atoms, which are observed around δC 124 (C-12) and δC 139 ppm (C-13). In ursanes, the proximity of methyl group 29 with the double bond promotes a steric effect on these carbons, causing a shielding effect on C-13 and deshielding on C-12 [27,34]. This effect can be observed by comparing the 13C-NMR data of O3 and U6, for example. Additionally, the number of quaternary carbon signals also represents a distinction parameter between these two skeletons, since 6 signals are observed in the oleananes spectrum and 5 signals in the ursanes spectrum.

2.7. Other Triterpenoid Skeletons Isolated from Celastraceae

In addition to the PCTT types described above, other 21 types of pentacyclic structures were also isolated from Celastraceae species (Figure 11). The terpenoid skeletons are gammacerane (OT1), taraxane (OT2), hopane (OT3, OT4), glutinane (OT6, OT16, OT18, OT19), taraxerane (OT7, OT21), germanicane (OT17) and unidentified types (OT5, OT8, OT9, OT10, OT11, OT12, OT13, OT14, OT15, OT20).
Figure 11

Structures of pentacyclic triterpenoids classified as others isolated from Celastraceae species (2001–2021).

3. 13C-NMR Data of Pentacyclic Triterpenoids Isolated from Celastraceae Species (2001–2021)

Table 1, Table 2, Table 3, Table 4, Table 5, Table 6, Table 7 and Table 8 list the literature 13C-NMR data of the PCTTs that were isolated and characterized in the period of 2001–2021.
Table 1

13C-NMR data of friedelane-type pentacyclic triterpenoids isolated from Celastraceae species (2001–2021).

CF1F2F3F4 aF6 bF7F8 bF9F10F11
125.022.322.322.322.822.3202.822.2202.422.8
241.641.441.241.442.741.560.641.460.441.9
3213.3212.7212.3212.7211.9213.0204.0213.0203.8212.1
452.158.158.058.157.858.258.958.158.658.3
543.141.841.841.942.442.038.142.037.442.4
642.241.140.841.241.741.341.541.140.241.5
717.918.318.418.122.720.020.418.317.918.9
852.851.352.052.954.453.552.449.948.850.8
944.138.338.138.238.037.837.137.436.638.0
1060.159.359.159.459.859.472.359.571.559.8
1176.947.047.347.437.135.634.934.933.735.6
1242.072.171.272.731.631.229.929.329.130.4
1341.144.845.745.341.040.639.739.939.339.9
1438.241.140.840.446.844.142.939.238.840.2
1532.431.650.333.475.574.631.336.838.740.2
1635.935.9218.336.148.448.478.174.375.575.7
1730.031.345.730.830.930.235.041.037.037.7
1842.544.345.444.242.641.645.541.745.646.66
1935.431.738.538.432.235.635.733.733.834.3
2028.133.327.828.428.428.128.128.027.728.6
2132.729.931.532.736.231.931.833.833.235.0
2239.238.130.739.639.538.734.919.826.227.8
236.96.86.86.87.26.87.36.77.07.5
2414.814.614.614.614.414.515.814.715.715.1
2512.919.218.719.316.917.918.219.218.819.4
2620.118.720.520.565.814.063.216.516.817.7
2719.511.69.011.619.718.720.919.719.120.0
2832.031.727.331.832.732.625.971.329.931.0
2931.771.631.334.935.730.937.837.031.832.7
3035.029.235.031.931.035.630.431.836.236.9
C=O 171.3
OCH3 21.3
Ref[35][36][37][38][39][40][41][42][43][44]
C F12 a F13 F14 b F15 a F16 F17 F18 F19 F20 F21
121.722.222.368.875.874.071.4202.722.322.3
240.941.441.651.935.030.152.760.641.541.3
3211.1212.8212.5210.4212.3213.2211.3204.1213.2212.7
457.458.058.357.555.953.359.159.158.258.1
541.542.142.339.443.342.743.937.842.041.8
640.541.141.441.841.841.234.340.641.240.2
718.018.418.617.817.918.218.818.118.021.2
853.053.353.553.453.853.053.950.651.244.7
936.937.437.636.642.036.938.637.337.537.9
1058.759.359.764.857.452.462.671.959.559.0
1135.135.635.837.030.235.935.734.235.336.8
1230.030.730.829.931.030.530.429.830.233.9
1339.640.139.339.439.839.839.838.839.047.5
1438.839.140.139.337.538.438.538.738.856.3
1544.744.344.433.232.732.132.730.530.4213.3
1675.774.475.636.036.035.436.235.936.153.8
1740.536.432.130.429.930.030.232.532.534.0
1839.944.144.841.942.742.743.044.244.345.3
1929.330.435.830.835.328.935.536.035.938.9
2032.733.128.033.228.133.428.234.334.428.0
2127.727.532.127.832.728.233.074.374.371.7
2229.536.436.039.739.328.139.347.047.046.3
236.46.96.87.16.76.96.97.36.86.8
2414.014.614.716.014.714.317.416.014.614.9
2517.518.118.218.463.017.919.218.217.718.9
2621.120.120.118.620.120.020.217.818.215.4
2719.321.421.521.018.618.718.719.319.312.1
2866.725.424.932.132.232.232.233.133.231.5
2974.074.430.874.535.028.931.824.931.931.4
3025.425.735.525.931.772.034.931.824.933.8
Ref[45][46][27][45][47][48][48][49][50][51]
C F22 F23 F24 F25 F26 F27 F28 b F29 F30 F31
122.4202.824.724.6202.822.522.422.3202.722.1
241.660.542.642.560.641.641.641.560.641.3
3213.2230.7212.9212.8204.1213.3211.7212.9204.1213.6
458.459.758.558.558.958.457.958.359.057.8
542.437.542.442.438.142.342.142.137.241.9
641.438.541.841.741.741.541.241.440.641.0
718.417.017.918.020.418.618.418.318.018.1
853.445.253.753.952.053.853.253.551.552.2
937.637.142.042.037.137.637.537.537.837.3
1059.669.060.760.772.459.759.259.671.959.1
1135.835.829.930.035.037.835.735.533.435.3
1230.826.531.231.429.924.130.530.029.729.9
1339.838.139.739.939.745.440.139.639.239.1
1438.440.037.737.942.038.438.238.439.138.0
1532.534.732.733.020.132.229.531.131.231.3 *
1638.836.836.035.035.336.232.629.229.029.0
1730.030.830.133.130.430.336.635.135.135.1
1842.844.042.741.943.543.339.038.939.339.2
1936.035.435.337.035.437.129.831.534.434.4
2033.928.328.142.728.328.533.633.328.127.9
2175.832.532.7218.732.932.629.230.231.431.4 *
2248.638.939.255.039.140.133.028.334.333.2
236.97.57.07.07.37.17.26.87.36.7
2414.815.714.714.715.714.914.714.715.914.5
2518.067.163.062.717.818.218.018.218.118.0
2620.869.920.120.964.022.320.118.619.118.9
2718.919.318.518.419.763.419.019.119.219.1
2834.530.032.133.631.732.867.169.068.067.0
2934.931.435.028.834.535.873.628.634.232.9
3024.135.131.725.032.030.627.573.432.834.2
Ref[52][53][48][54][41][55][56][57][58][57]
C F32 F34 F35 F36 F37 F38 F39c F40 F41 F42
122.722.222.525.932.431.728.224.8202.722.3
241.441.341.675.476.974.471.042.660.641.5
3213.4212.2212.8105.6212.0209.7199.6212.3204.1212.9
458.657.958.647.452.752.4127.158.659.158.3
542.342.042.446.842.754.2158.842.337.842.1
641.940.841.733.340.836.730.441.640.641.4
718.418.518.519.217.519.420.318.218.018.3
853.252.353.749.852.749.647.354.052.053.1
938.037.537.837.138.037.537.241.137.237.5
1059.659.059.953.252.755.751.860.371.959.6
1135.735.236.034.335.634.532.430.134.535.7
1231.028.930.829.030.229.428.930.730.129.4
1337.639.038.639.239.440.239.239.939.639.9
1439.340.640.339.138.939.439.537.938.338.2
1528.650.233.029.132.728.327.933.132.132.2
1632.8218.436.236.236.529.635.134.935.829.7
1748.645.730.830.129.844.837.733.030.030.0
1835.943.242.344.542.445.443.441.842.642.9
1929.830.139.830.435.031.631.336.929.430.6
2033.732.733.440.627.841.441.942.733.433.4
2128.027.030.030.032.0214.2213.7218.728.128.3
2233.731.128.136.640.877.553.355.038.139.9
237.26.97.07.16.37.910.77.07.36.8
2415.014.614.972.413.8174.2 14.816.014.7
2517.517.218.116.717.916.817.065.118.118.0
2620.520.318.616.218.415.515.021.520.018.6
2719.215.920.917.519.919.417.918.618.619.9
28208.927.432.331.932.125.432.333.832.132.2
2924.474.175.0179.431.7 28.828.929.0
3074.725.826.132.134.715.014.725.072.072.1
OCH3 51.7
C=O 166.8
Iso 130.2
Orto 129.5
Meta 128.6
Para 133.1
Ref[48][46][59][48][60][61][62][54][49][57]
C F43 F44 F45 F47 F49 F50 F51 F52 F53 F54
131.3200.527.622.222.339.036.126.726.7210.9
2193.1102.641.241.541.5211.4211.772.773.253.9
3146.5175.5213.0213.0213.077.277.0106.3106.875.4
4126.949.957.958.258.254.854.645.645.750.0
554.741.641.742.142.138.038.152.847.044.5
630.741.140.741.241.341.140.772.833.642.7
718.417.617.818.018.217.317.630.419.218.2
849.452.351.552.850.453.853.246.549.753.2
937.037.137.437.137.541.837.737.037.037.2
1055.868.759.059.259.660.860.552.752.671.8
1133.135.334.835.435.229.535.134.034.135.2
1229.230.430.430.630.530.520.329.729.030.9
1339.239.437.538.739.3 *39.739.739.239.140.6
1439.138.338.437.639.4 *38.238.438.949.138.8
1528.932.532.632.430.032.732.429.129.033.3
1636.036.029.334.936.235.936.036.136.236.6
1730.129.942.447.730.230.030.030.530.131.1
1844.442.738.536.444.642.642.944.544.542.6
1930.435.134.135.429.235.335.430.130.430.7
2040.528.232.828.340.628.128.240.540.534.0
2129.932.831.032.429.632.732.830.030.028.7
2236.539.322.028.036.639.239.336.536.440.5
2310.68.56.66.86.810.910.89.96.912.4
24194.915.114.314.614.614.014.264.672.218.4
2517.418.117.017.217.563.717.416.516.719.0
2615.920.419.020.018.520.320.216.116.121.3
2717.218.716.118.816.118.518.51.417.419.1
2831.832.0177.0209.131.932.231.131.831.832.7
29179.135.026.734.5179.335.031.8179.1179.174.7
3031.931.779.729.431.931.735.032.032.026.9
OCH351.555.6 51.5
Ref[63][64][48][65][66][47][67][68][48][69]
C F55 F56 F57 F59 b F60 F61 F62 F63 F64 b F65 c
121.729.6146.335.621.922.322.474.028.726.6
237.172.4130.141.141.241.741.729.774.268.5
3216.6202.3200.9212.4212.4212.8212.7231.2108.171.2
458.7129.557.758.158.258.858.853.346.842.8
539.9157.849.142.542.641.341.342.747.549.0
637.465.477.250.452.249.048.941.234.037.2
717.729.928.769.268.668.468.318.119.719.0
853.540.948.258.258.652.952.653.150.449.2
937.038.536.738.839.037.237.636.937.544.0
1049.448.960.359.358.960.059.852.453.350.0
1135.733.445.436.035.937.631.232.734.733.8
1230.529.569.329.929.630.537.529.529.528.8
1339.739.340.040.340.340.439.539.739.639.6
1438.340.645.644.240.039.144.938.039.338.8
1532.428.349.627.029.532.432.830.229.727.8
1636.029.8214.235.538.335.829.135.336.728.9
1730.045.247.130.130.430.538.330.030.536.4
1842.745.844.743.342.341.638.042.444.845.0
1935.332.039.621.935.329.635.131.330.930.9
2028.141.742.328.333.533.128.540.240.740.8
2132.7214.1218.132.427.927.935.928.230.5213.2
2239.278.147.239.236.139.432.538.237.476.7
2313.511.19.86.96.96.96.96.88.411.3
2423.1 8.715.915.916.116.114.472.1176.5
2518.017.019.618.818.919.018.817.516.915.2
2620.415.819.964.213.121.821.420.916.817.3
2718.719.38.720.120.818.318.517.718.118.6
2832.125.929.131.231.832.1179.232.032.125.5
2935.0 28.434.729.174.534.431.8181.3
3031.715.424.431.171.326.029.6183.132.314.9
Ref[70][71][72][39][73][48][48][48][74][75]
C F66 F67 + F68 F69 b F70 b F71 F72 F73 F74 F75 b
130.828.232.630.939.022.322.222.336.520.3
274.176.575.0193.5194.641.542.041.5212.338.9
3213.3208.1212.4149.0144.2213.2213.3213.377.3105.9
452.754.355.6125.8139.958.258.258.354.853.7
543.143.143.154.940.042.144.742.039.647.0
641.341.041.232.733.641.241.541.340.933.9
718.518.218.118.918.218.218.418.217.919.4
850.950.453.249.550.853.152.950.751.050.0
937.236.637.437.137.837.537.737.438.337.3
1052.653.356.555.556.159.459.259.860.957.1
1135.435.135.333.335.035.635.936.135.034.6
1230.530.130.230.930.730.331.029.529.729.4
1339.539.239.739.439.739.741.039.238.039.4
1439.739.338.139.639.838.038.839.139.539.2
1529.830.432.830.530.632.829.329.430.129.3
1637.836.235.436.636.835.432.636.636.536.5
1730.429.129.630.531.229.537.630.130.530.3
1844.844.542.544.845.042.537.644.244.744.6
1930.836.931.329.529.931.235.429.330.630.7
2040.740.640.340.740.940.328.440.440.640.5
2129.729.928.229.430.128.234.830.229.730.3
2236.729.438.237.437.238.232.635.237.137.2
236.86.56.510.710.56.86.86.911.28.4
2414.214.114.7195.819.114.614.614.614.672.9
2518.018.317.817.218.217.717.518.418.116.7
2618.516.120.917.918.520.920.716.318.217.9
2716.117.517.716.217.017.718.518.016.616.5
2832.131.831.832.332.032.0185.031.832.231.9
29181.231.9183.3181.5181.231.929.7184.832.1181.2
3032.1179.432.032.132.3184.734.531.5182.432.2
COOCH3 179.4
COOCH3 51.6
COOCH3 169.8
COOCH3 21.2
Ref[76][77][78][59][79][80][56][81][82][83]
C F76 F77 c F79 F80 F81 F82 F83 F84 F85 F86
119.326.622.416.0148.2202.7202.822.222.322.3
236.367.641.735.4130.460.660.640.841.141.4
371.983.1212.773.0201.5204.0204.2212.1212.1213.1
452.943.358.849.457.659.059.157.958.158.2
537.448.641.338.043.737.837.842.242.242.0
640.933.348.941.939.540.540.641.041.040.5
717.418.768.317.718.118.118.118.418.621.3
852.649.652.953.751.552.452.253.0*53.145.3
937.036.837.637.336.837.237.255.543.837.2
1059.652.259.861.561.971.871.953.1*59.359.3
1135.633.731.135.834.434.534.6214.251.434.4
1230.928.737.830.928.830.330.251.2214.229.4
1337.838.639.540.139.039.739.544.055.542.4
1438.638.644.638.540.538.138.243.844.054.2
1532.329.432.832.849.832.732.431.635.6214.9
1629.235.929.236.1218.735.035.936.136.254.0
1744.529.738.430.745.333.230.029.629.733.5
1837.644.038.442.043.941.842.736.436.644.0
1934.529.735.129.935.437.035.335.431.734.9
2028.240.628.533.327.642.828.228.328.427.9
2135.129.435.828.031.6218.832.833.033.133.8
2232.236.332.439.730.755.039.338.939.138.6
239.614.36.911.86.77.37.36.86.96.8
2414.396.516.116.613.716.016.014.514.615.0
2517.416.318.818.419.117.818.018.118.217.4
2620.316.121.720.819.821.320.319.019.914.7
2718.317.218.518.716.218.518.719.819.118.9
28183.731.7183.332.327.433.532.031.831.932.2
2929.5179.634.375.035.228.831.831.731.833.3
3034.231.629.726.031.125.035.034.234.333.4
Ref[48][84][48][69][45][52][85][86][35][51]
C F87 F88 F89 F90 F91 b F92 F93 a F94 F95 F96
122.221.622.218.617.016.016.241.327.831.4
241.440.841.435.440.335.536.141.6170.4193.2
3212.5210.6212.872.074.772.071.6213.0177.0146.5
458.257.858.149.449149.449.659.547.3127.0
542.147.042.038.341.437.938.142.238.954.7
641.056.941.241.936.041.842.035.634.530.6
718.6210.218.117.519.317.717.730.717.118.3
852.463.453.052.953.853.253.353.452.048.7
937.742.437.443.936.837.137.237.535.337.0
1059.459.059.462.361.661.561.658.246.156.0
1135.435.535.576.636.535.535.722.4 *32.033.3
1229.129.830.442.031.430.330.732.930.128.8
1339.239.439.638.537.639.738.438.339.640.7
1440.537.538.240.939.938.039.740.038.039.5
1550.231.632.232.332.532.332.318.4 *32.328.2
16218.836.335.936.035.632.035.937.135.735.9
1745.330.129.930.030.736.130.042.830.031.4
1844.041.842.842.643.638.542.942.042.645.3
1935.534.935.235.735.629.335.435.135.229.8
2027.628.028.028.128.833.128.233.328.1149.1
2131.732.832.732.832.928.432.9218.832.630.7
2230.838.639.239.239.028.739.355.139.138.0
236.86.86.712.114.811.912.16.912.510.7
2414.715.114.516.765.816.516.617.920.6194.9
2517.318.217.813.518.418.318.314.872.618.1
2620.319.218.519.918.920.020.133.620.215.1
2716.219.420.119.520.818.818.721.418.517.9
2827.432.132.032.033.666.732.118.632.131.4
2931.131.831.735.035.673.835.025.135.0
3035.234.634.931.732.726.531.828.931.6107.6
Ref[57][57][57][87][88][69][89][90][47][91]
C F97C F98 F99 F100 F101 F102 F103
126.922.028.719.121.321.1116.0
2105.041.271.534.538.037.2166.1
377.1212.8200.1175.6176.2177.8
447.757.9127.736.135.836.2197.9
544.641.9159.236.837.537.9135.5
630.141.030.938.838.739.0136.0
718.618.020.818.017.918.2118.6
848.153.147.752.652.153.1163.3
937.537.237.642.938.839.139.2
1052.159.252.358.259.659.9165.9
1133.335.333.184.134.735.331.2
1228.829.829.537.629.530.329.2
1340.238.039.540.739.039.738.3
1439.139.640.037.937.938.447.6
1528.332.328.132.131.132.428.5
1629.635.529.735.929.036.136.6
1744.830.144.930.035.030.130.4
1845.641.645.342.639.343.044.6
1931.730.331.735.334.335.431.1
2041.531.441.328.127.828.240.4
21213.927.7214.032.733.232.929.7
2277.438.877.239.231.339.334.4
2316.16.611.27.77.37.618.1
24175.314.4 22.119.219.5
2516.617.615.613.617.818.025.6
2615.818.219.119.918.620.224.0
2719.320.717.519.319.018.720.3
2826.131.825.232.067.332.231.5
29 74.3 34.932.635.0179.1
3015.625.914.831.733.931.932.8
C=O 161.2
OCH3 51.8
OCH3 51.8
Ref[62][92][93][94][95][95][96]

Ref: References; + 13C-NMR data of acetylated compound; * Values bearing the same superscript are interchangeable; Solvent: CDCl3; a CDCl3 + Pyridine-d5, b Pyridine-d5; c DMSO-d6; 13C-NMR data of some compounds were not found. In these cases, the reported identification was performed by comparison of other physical data: F5 [97], F33 [98], F46 (1H-NMR) [99], F48 (1H-NMR) [100], F58 (IR, MS) [101] and F78 (X-ray) [102].

Table 2

13C-NMR data of quinonemethide-type pentacyclic triterpenoids isolated from Celastraceae species (2001–2021).

CQ1Q2Q3Q4Q5Q6 bQ7Q8Q9Q10
1121.6119.8119.8164.7119.5119.7119.8120.0119.5119.8
2178.8178.4178.3178.3178.1178.4178.4178.1178.3178.4
3145.9146.0146.2146.0145.9146.1146.2146.3146.0146.1
4118.0117.0117.5118.2118.0117.2117.1116.8117.2117.2
5128.6127.5128.5127.5127.3127.9127.9127.9127.3127.8
6132.2133.8132.1134.0134.0133.3133.3134.4134.0133.6
7118.8117.9118.6117.2118.0118.3118.3121.9118.0118.2
8167.2165.7164.9169.7170.1168.7168.718.6169.7168.4
948.143.043.047.843.042.942.944.642.442.6
10161.6164.4164.2164.0164.8164.2164.2159.7164.6164.7
1165.334.332.533.733.033.233.237.333.534.0
1243.427.531.130.230.029.929.935.929.530.0
1340.640.339.042.640.740.040.042.439.240.6
1444.947.349.644.645.044.244.2136.944.544.3
1528.7129.473.028.428.629.429.4128.628.228.3
1636.2135.641.468.236.5 *35.735.740.536.129.5
1730.8733.737.630.231.635.935.939.838.144.8
1843.942.643.746.943.243.343.343.746.145.1
1930.8130.731.929.624.8 **36.936.940.730.832.0
2040.441.041.839.435.773.773.775.042.640.9
2129.729.4213.728.424.8 **214.9214.9213.038.1213.5
2234.332.354.238.336.5 *50.550.550.567.976.4
2310.410.310.310.310.410.310.310.410.110.3
24
2534.437.441.038.338.938.538.529.638.139.2
2621.428.823.621.721.623.323.322.121.621.6
2718.518.023.519.721.419.419.423.719.020.5
2831.427.432.924.231.433.233.230.424.025.0
29178.7178.3 178.2 29.0 178.2
3032.731.315.032.469.6 29.024.832.214.7
OCH351.851.6 51.8 51.6
Ref[103][104][104][105][106][107][108][104][109][63]
C Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 Q19 Q20 c
1119.4120.6119.7120.0119.6119.4119.9120.0119.4119.8
2178.4178.3181.1178.1178.3178.4178.0178.1178.8178.6
3146.0147.0161.9146.3146.0146.0146.2146.2146.1146.3
4117.1127.5140.9116.8117.1117.2116.7116.7118.6117.4
5127.5120.4117.2128.1127.4127.4127.5127.7127.6127.6
6133.9135.4131.7134.4133.9134.2134.9134.5137.8134.4
7118.2118.3200.4122.1117.9118.2121.6121.5122.2118.3
8169.8165.341.9158.6170.1170.7159.7159.0160.2170.4
942.939.358.444.242.943.344.544.545.543.0
10164.7172.6146.6159.7165.0164.4159.7159.9163.5165.1
1133.628.732.136.033.933.137.537.437.333.6
1229.829.330.231.829.729.435.634.835.229.7
1339.439.939.642.141.340.043.142.443.339.5
1445.043.129.2135.644.844.0135.3136.0135.545.1
1528.629.527.9127.928.429.7128.3126.6129.828.7
1636.432.435.945.636.036.537.837.939.036.4
1730.845.331.036.331.630.233.738.935.630.9
1843.644.244.247.844.943.743.938.743.644.4
1925.533.828.837.830.425.233.933.934.230.9
2046.231.040.541.7147.933.042.647.448.040.5
2125.134.529.8213.830.522.528.669.268.029.9
2234.036.336.549.836.935.236.179.439.034.8
2310.310.510.210.410.210.310.310.310.510.3
24
2538.438.438.228.538.937.729.429.529.438.3
2621.721.521.521.321.323.421.921.821.921.7
2718.418.718.323.119.717.924.024.524.318.4
2831.531.531.530.231.136.231.527.031.131.7
29177.4182.5178.8 69.3179.3179.0178.8179.1
3074.130.730.816.0108.2 19.813.717.532.7
OCH351.9 51.4 51.852.752.351.7
Ref[91][110][111][112][113][91][104][109][109][114]
C Q21 Q22
1119.8119.8
2178.6178.4
3146.3146.0
4117.4117.1
5127.8127.7
6134.1133.6
7118.3118.1
8170.3168.7
943.242.7
10165.1164.7
1134.033.8
1230.229.9
1340.740.6
1445.244.6
1528.928.5
1637.435.5
1730.638.2
1844.343.5
1925.032.0
2031.441.8
2171.2213.6
2244.452.5
2310.410.2
24
2538.939.0
2621.821.5
2721.419.7
2835.432.5
29
3018.615.1
Ref[115][116]

Ref: References; *,**: Values bearing the same superscript are interchangeable; Solvent: CDCl3; b C6D6:CDCl3; c CD2Cl2.

Table 3

13C-NMR data of aromatic-type pentacyclic triterpenoids isolated from Celastraceae species (2001–2021).

CA1A3A5A6A7A8 +A9 aA10 bA11A12 c
1109.5109.1108.4108.6125.6105.9110.0108.4106.8109.0
2150.8144.2140.9148.0147.7156.0144.0148.8150.0151.7
3152.8132.9139.7140.6140.3146.2126.8141.4143.0143.5
4113.2132.0122.0125.4125.1134.1122.7126.1128.0127.9
5141.9154.9126.6122.5122.6123.7151.4122.3119.0119.9
6201.2187.228.3187.6187.7187.7187.3187.9201.2182.8
743.8126.118.5126.1108.8126.1126.8126.074.5147.4
835.4151.944.1171.2172.1171.4150.7170.850.3139.1
938.640.436.840.144.440.640.640.338.1140.7
10123.5171.2143.8151.2151.9154.9170.7151.2152.8152.8
1132.434.034.133.834.435.634.635.636.334.2
1229.929.830.230.029.930.230.230.330.630.5
1336.838.938.939.640.840.639.340.040.540.0
1435.944.739.443.840.144.844.644.339.147.2
1530.328.529.029.028.228.828.928.429.729.6
16NR36.436.535.536.8 **37.536.632.136.237.8
1735.730.830.336.231.630.830.638.429.831.1
1840.444.344.543.344.842.744.443.544.145.4
1929.530.530.636.830.5 *27.931.134.329.831.9
2039.140.340.673.8148.2132.444.442.041.041.7
2129.629.730.0215.030.5 *119.930.1214.729.930.9
2228.234.836.250.236.8 **35.235.152.734.036.2
23 14.711.313.613.614.414.813.714.014.0
24
2531.937.627.437.938.439.237.838.627.541.6
2625.320.815.922.120.421.420.920.815.919.6
2716.718.317.319.419.615.718.519.715.920.6
2815.231.631.833.131.133.131.632.631.732.1
29179.4178.8179.328.9106.524.0178.7 179.8180.7
3031.532.731.9 32.615.131.932.9
OCH355.751.5 56.0
OCH355.161.151.5 60.751.5 51.452.2
Ref[117][118][119][120][106][121][122][123][124][125]
C A13 A14 A15 A16 A17 + A18 A19 d A20 A21 A22
1107.9107.5109.2107.9104.1110.1116.6112.4107.8108.8
2150.0148.4146.6150.0156.3151.7150.7152.6 *141.7148.2
3141.4140.9139.5141.4146.1144.7150.0143.5140.4140.7
4129.1127.0130.0129.1135.1134.0117.0120.4122.0125.6
5122.8124.5125.0122.8125.1122.4122.3121.8123.9122.5
6182.0201.9200.7182.0201.0185.8186.3185.843.9187.7
7197.037.937.7197.037.7129.3125.2124.8209.8125.9
860.342.942.660.342.5160.1174.4177.4 **58.3171.3
938.737.637.238.738.042.240.541.738.840.3
10153.6153.2152.2153.6156.2151.2150.4151.7 *142.4151.7
1133.536.633.233.533.837.133.735.033.734.3
1227.830.1529.927.829.635.829.630.829.430.2
1339.539.738.839.540.240.739.440.739.140.1
1439.239.239.439.240.3134.745.146.438.744.4
1538.728.828.538.728.2125.928.730.028.428.4
1635.836.436.235.838.538.026.437.636.135.5
1730.230.730.330.230.748.830.531.630.338.2
1843.645.144.743.642.946.244.345.743.643.5
1930.631.130.530.627.634.230.831.930.632.0
2040.741.140.140.7133.050.340.141.340.641.9
2130.330.129.830.3120.274.329.830.929.8214.0
2235.833.536.135.835.4214.034.836.035.952.6
2313.814.013.2 14.315.1200.2173.1 **11.513.7
24
2531.526.025.631.527.021.636.337.427.938.5
2614.715.715.414.715.421.720.521.315.120.7
2716.915.716.916.915.423.918.719.416.819.7
2831.532.131.731.533.022.531.632.131.532.6
29180.0180.1179.1180.024.0175.2181.2182.5 **179.4
3032.532.932.232.5 13.732.633.232.315.1
OCH3 56.052.7
OCH351.852.251.451.860.661.7 51.6
1′ 126.5 170.0
2′ 104.2 121.3
3′ 147.4 112.2
4′ 135.8 146.2
5′ 147.4 150.8
6′ 104.2 125.2
7′ 77.2 114.2
8′ 75.5
9′ 62.8
OCH3 56.4 56.1
OCH3 51.4
OCH3 20.6
C=O 170.3
Ref[119][124][126][119][124][109][127][127][119][128]
C A23 A24 A25 a A26 a A27 d A28 A29
1108.3107.7110.7110.6108.5116.5113.8
2141.4141.6143.4141.3142.9150.5173.7
3139.8139.5145.2143.1141.9149.7155.5
4122.5120.9121.4122.5119.6116.3111.3
5126.3125.7126.7126.0122.8117.1119.4
628.027.845.446.1120.9186.0188.0
718.3126.0119.6120.9137.3122.8124.4
843.3139.0151.1NR43.3149.1153.4
936.736.238.338.1144.145.345.6
10143.8140.0142.6145.1128.5125.3152.8
1134.233.037.637.7119.436.436.6
1230.029.431.430.632.628.628.6
1340.043.538.838.739.439.739.7
1439.358.044.744.540.140.540.5
1527.9211.429.929.723.331.030.9
1629.647.537.637.436.734.834.8
1744.949.431.130.931.144.143.0
1845.444.345.144.946.344.144.2
1931.730.731.331.130.729.829.8
2041.340.040.840.638.330.730.5
21214.2212.431.431.229.229.829.8
2277.677.835.935.737.233.534.4
2311.511.613.413.811.1200.3178.7
24
2528.233.436.535.722.436.436.8
2615.325.622.722.419.120.620.2
2719.221.418.918.818.732.832.7
2825.224.632.031.932.718.318.3
29 181.3181.0179.7178.9179.8
3014.814.833.533.330.431.831.6
CH3 22.721.4 51.651.6
CHOH 70.872.1
Ref[129][39][130][130][127][131][131]

Ref: References; + 13C-NMR data of methylated compound; *,**: Values bearing the same superscript are interchangeable; NR: Not reported; Solvent: CDCl3; a Pyridine-d b CDCl3+CD3OD, c CD3OD; d DMSO-d; 13C-NMR data for A2 were not found. The reported identification was performed by comparison of 1H-NMR data from Sotanaphun [132]. 13C-NMR data for A4 were reported by Shirota et al. [122], but the chemical shifts were not attributed to each carbon atom.

Table 4

13C-NMR data of dimer-type pentacyclic triterpenoids isolated from Celastraceae species (2001–2021).

CD1D2D3D6D7D8D9D10D11D12
1115.5108.2115.5113.0113.0113.1113.0113.1115.5115.0
2191.2144.3191.0191.5191.5191.5191.6191.4190.2189.4
391.7140.691.891.391.391.291.391.392.091.1
479.9123.279.079.579.579.579.479.579.476.9
5130.8124.6130.8134.1134.3134.1134.3134.1130.2132.2
6126.171.4125.9134.1133.9133.9134.1133.8126.6128.5
7116.273.7116.124.224.224.224.224.2116.3117.2
8160.644.7160.641.641.241.641.141.6160.4163.3
941.740.241.737.437.437.437.337.441.743.4
10173.8143.7173.5170.2169.8170.0169.8170.0173.8172.9
1132.734.732.730.730.530.630.732.033.233.1
1229.530.729.529.429.429.429.729.429.8 129.8
1338.139.638.138.940.1138.940.0 140.139.5 239.9
1444.540.0044.540.140.2140.139.9 138.944.344.0
1528.431.428.428.327.928.4127.728.328.328.5
1636.536.136.436.035.336.029.336.035.4 335.4
1730.529.830.230.238.130.244.7 230.138.3 438.2
1844.643.644.144.643.944.645.444.643.443.6
1930.929.930.930.531.830.531.730.532.131.9
2040.540.640.540.542.340.541.240.542.341.9
2129.930.729.929.9213.829.9213.829.7213.6213.6
2234.837.034.736.053.536.077.236.052.552.4
2322.411.122.522.722.722.722.822.722.324.6
24
2534.828.034.822.122.922.123.022.135.639.7
2622.517.622.516.015.716.015.816.022.322.4
2718.618.318.616.918.116.918.916.820.119.7
2831.631.931.731.732.731.725.131.732.8 532.5
29179.11179.4179.0 1179.0 179.0 179.0
3032.931.731.932.315.232.314.932.315.2 615.1
OCH351.7251.351.5 251.7 51.7 51.7
1′110.4109.5110.4110.5110.6110.4110.6110.4109.6108.8
2′139.1140.1141.3144.5144.5144.5144.5144.5145.0145.3
3′136.2138.9137.0138.3138.3138.4138.2138.4137.6137.4
4′122.9125.6125.5129.4129.4129.5129.3129.6129.0129.7
5′127.9123.6127.2123.3123.3123.4123.7123.4126.0125.3
6′26.428.075.2187.2187.2187.1187.2187.0201.1200.0
7′18.518.521.8126.3126.3126.3126.3126.337.637.4
8′43.944.138.5171.0171.0170.0171.1169.741.941.8
9′36.836.937.640.140.1 139.940.139.737.137.0
10′144.4145.1144.7151.8151.8151.7151.8151.7151.7152.2
11′33.934.333.834.234.334.434.334.632.933.2
12′30.030.329.829.729.930.229.929.829.7 129.5
13′38.939.038.939.039.040.239.040.139.4 239.2
14′39.439.439.144.744.744.344.8 244.040.039.8
15′28.929.129.028.528.628.3 128.628.228.027.7
16′36.436.336.136.436.435.536.429.635.3 329.3
17′30.630.229.330.530.538.230.544.9138.2 445.0
18′44.144.444.444.344.343.544.345.0144.045.3
19′30.429.530.531.031.032.031.130.131.831.7
20′40.440.640.440.640.641.940.640.941.941.3
21′30.330.730.329.929.7213.729.7213.6214.1214.0
22′36.336.636.635.035.052.735.076.153.677.2
23′10.910.910.613.413.413.413.413.413.013.3
24′
25′27.227.231.537.737.738.737.638.926.226.5
26′15.816.116.320.920.920.820.820.915.015.1
27′17.217.317.418.618.520.018.620.818.219.0
28′31.831.926.431.631.632.631.625.032.6 525.1
29′178.7 1179.8178.7 1179.2179.3 179.4
30′32.730.832.732.932.915.133.014.815.1 614.8
OCH351.5 251.651.7 251.651.6 51.7
OCH3 55.4
Ref[133][134][133][135][136][136][137][137][136][136]
C D13 D14 D15 D16 D17 D18 D19 D20 D21 D22
1114.0108.349.1108.6107.8107.6109.1108.8111.4108.9
2191.2144.4193.1146.5142.0141.4144.9141.1149.6137.9
391.3140.7192.1141.7137.7141.4142.7141.7143.2142.2
479.1123.260.5123.0121.4120.8122.3121.3126.0121.1
5134.7124.7131.7125.4124.3124.4125.7126.0124.1125.0
6135.971.528.2124.3124.4123.6124.3124.2187.7124.3
768.574.518.3128.6128.4127.7128.7129.2126.1128.8
851.745.145.745.445.644.844.445.6171.245.5
941.140.337.437.537.236.337.237.240.0537.0
10168.7143.7148.8143.6142.2141.3143.3142.8151.7141.8
1131.234.831.031.031.130.430.531.234.1231.9
1229.430.429.730.030.429.238.230.528.530.5
1339.439.739.638.939.338.138.838.939.038.8
1441.840.039.339.039.238.245.439.044.639.0
1531.031.728.928.128.127.328.128.229.828.1
1636.236.236.435.536.035.635.436.035.436.2
1730.029.830.330.330.629.630.330.430.530.4
1844.843.644.544.444.543.743.644.544.344.4
1930.630.030.430.630.029.230.030.130.831.0
2040.6140.740.740.640.539.740.540.540.440.5
2129.831.630.029.729.929.829.929.929.929.4
2235.837.136.736.536.436.135.936.436.436.3
2322.411.19.010.810.89.910.710.713.110.9
24
2524.028.022.322.216.821.622.122.337.722.3
2616.517.816.017.022.216.016.816.920.816.8
2717.418.317.217.517.416.617.317.418.317.4
2831.732.0031.931.831.831.031.731.831.631.8
29179.0179.4179.2179.3179.1178.3179.1179.1178.8179.1
3032.432.0031.932.232.131.332.132.132.732.1
OCH351.751.651.651.651.550.751.651.551.551.5
1′110.6107.960.892.787.190.392.290.592.7139.9
2′144.2141.624.438.641.844.636.345.838.436.0
3′138.0139.141.3128.7124.2124.4128.2128.2128.174.2
4′129.3122.039.8140.5151.2141.2140.6140.6140.690.1
5′123.5124.144.497.184.389.496.889.796.8134.6
6′187.2124.325.138.135.235.238.984.639.130.0
7′126.2128.636.143.745.339.945.541.443.349.4
8′171.045.8151.436.038.935.832.729.734.829.9
9′40.237.542.532.739.029.731.129.633.039.8
10′151.9143.836.240.132.943.039.443.239.342.6
11′34.231.734.8151.0151.9150.6151.1140.1150.8150.7
12′29.930.021.9108.7108.4108.0108.6119.1108.8108.6
13′39.038.930.019.919.420.119.9169.720.020.5
14′44.739.116.719.120.317.819.119.019.117.1
15′28.630.4111.812.622.910.712.514.412.413.9
16′36.436.1
17′30.530.5
18′44.344.5
19′30.929.4
20′40.5 140.6
21′29.831.6
22′35.036.6
23′13.410.8
24′
25′37.622.3
26′20.917.2
27′18.417.3
28′31.631.8
29′179.0179.6
30′32.831.6
OCH351.751.4
Ref[136][134][75][138][138][138][138][138][138][138]
C D23 D24 D25 D26 D27 D28 D30 D31 D32 D33
1107.6108.2116.0114.8116.5114.6115.4108.2115.9114.9
2145.8142.4187.8187.3193.3189.6191.0144.4190.8189.6
3136.2138.692.290.893.191.391.8140.692.090.7
4122.7121.679.176.979.277.279.1123.079.477.2 11
5124.0124.6130.3131.7130.7131.3130.6124.7130.5132.1
6124.2124.2126.6128.8126.7129.8126.171.3125.9128.7
7128.3128.6116.0117.3115.7117.2116.274.2116.2116.9
845.645.6161.8164.4162.4164.8160.845.0161.2164.5
937.337.341.943.842.043.941.840.341.644.1
10143.0142.7174.4173.4174.8173.8173.8143.9173.4173.3
1131.131.132.832.933.432.8832.834.632.832.9
1230.130.029.229.429.329.329.530.329.229.9 1
1339.038.938.138.938.038.538.239.637.938.7
1438.939.044.644.344.644.444.539.944.644.4
1528.228.228.328.628.428.628.328.528.528.6 2
1636.436.036.336.236.236.236.436.136.336.4
1730.430.430.530.430.430.430.429.930.530.6
1844.544.544.044.144.144.144.243.944.244.4 3
1930.630.630.930.631.030.730.930.730.630.9 4
2040.540.540.040.339.740.140.540.740.340.5 5
2130.029.829.629.829.729.429.829.729.429.9 6
2236.036.434.634.834.334.434.836.934.734.8 7
2311.010.922.224.522.224.422.011.122.424.2
24
2522.322.234.839.235.239.134.828.237.539.3
2616.916.922.422.518.418.622.317.122.022.4
2717.517.418.818.522.222.218.718.418.918.3 8
2831.831.831.631.531.431.431.631.831.631.6 9
29179.1179.1184.5184.3182.4183.5178.7179.4184.4178.9 10
3032.132.132.632.431.832.432.731.332.732.8
OCH351.551.5 51.751.6 51.6
1′135.4142.7111.2110.836.237.9108.8108.2110.4110.7
2′36.534.5144.4145.018.718.8140.8142.1144.7144.2
3′74.278.8137.5137.440.441.3136.5138.0138.2138.5
4′89.986.1127.2128.333.033.1121.3121.0129.5128.2
5′137.7138.0124.4123.649.849.2126.0125.723.0124.0
6′32.135.0192.0189.935.735.9124.0124.4187.5187.8
7′49.646.3126.0126.1197.1198.4129.4128.9126.0126.2
8′29.730.0171.4171.0126.0125.945.545.9171.4171.5
9′39.638.540.340.0150.3151.337.437.640.039.9
10′42.634.7150.1151.137.737.7142.8141.9151.9151.1
11′150.7151.234.033.8112.6112.130.631.134.234.2
12′108.7108.529.329.1147.2147.030.030.029.929.6 1
13′20.420.438.938.5139.8139.438.939.039.039.0
14′17.119.344.744.6114.9115.839.039.144.644.7
15′14.022.328.328.432.832.528.429.928.528.5 2
16′ 36.236.221.321.336.036.136.336.4
17′ 30.430.323.323.230.630.530.430.6
18′ 44.144.1 44.544.544.044.3 3
19′ 30.530.7 31.030.731.130.8 4
20′ 39.740.1 40.440.640.240.4 5
21′ 29.529.7 29.730.029.329.7 6
22′ 34.434.5 36.436.734.434.7 7
23′ 12.913.2 10.811.013.212.8
24′
25′ 36.837.5 22.522.234.738.0
26′ 20.720.9 16.917.120.920.9
27′ 18.618.8 17.417.618.818.2 8
28′ 31.331.5 31.831.832.531.6 9
29′ 183.6184.3 178.7179.5183.6178.7 10
30′ 32.432.2 32.132.1 32.8
OCH3 51.651.532.451.6
Ref[138][138][139][139][139][139][133][134][139][136]
C D34 D35 D36 D37 D38 D39 D40 D41 D42 D43
1116.0114.9116.0109.0111.4115.8114.7115.5115.5115.0
2190.4189.5190.4145.1149.7191.1189.4190.2190.3189.5
391.890.691.8142.8143.391.991.092.092.091.0
479.476.979.3122.5125.278.877.379.379.476.8
5130.9132.0130.9125.7122.4131.1131.8130.3130.3132.1
6126.1128.7126.2124.6187.5126.1128.8126.6126.6128.7
7116.2116.8116.4128.3126.2116.4117.2116.3116.3117.3
8160.2164.6159.944.9170.2159.5164.4160.3160.1163.0
941.544.241.439.439.341.343.941.741.643.7 1
10173.2173.4173.2143.3151.7173.4173.2173.7173.8173.0
1133.332.833.531.734.333.532.833.233.433.3
1229.8 129.529.9 129.930.230.029.829.9 129.9 129.9
1339.538.639.538.339.939.538.639.439.439.8
1444.244.4 143.932.844.344.144.444.344.043.61
1528.328.628.127.528.428.328.628.328.028.2
1635.536.429.5 235.335.629.736.435.429.529.5
1738.230.544.735.438.239.030.538.244.745.0
1843.444.144.943.543.543.844.243.444.944.8
1932.230.832.131.032.032.130.932.132.131.9
2041.940.440.840.141.941.840.541.940.840.9
21213.629.9213.5214.3213.7213.629.8213.6213.6213.5
2252.534.776.553.952.652.535.052.576.576.4
2322.124.222.210.813.222.124.622.322.224.6
24
2535.739.335.832.838.735.639.235.635.640.1
2622.322.422.418.620.822.322.322.322.422.3
2720.118.220.916.119.715.018.220.020.920.4
2832.531.525.022.732.632.531.632.625.025.0
29 178.8 179.1
3015.132.714.715.115.120.032.915.114.814.8
OCH3 51.6 51.6
1′110.5110.7110.692.992.8108.1110.6111.4111.3110.6
2′144.4144.3144.438.438.8141.6145.2144.6144.6145.1
3′138.3138.5138.3128.2128.1137.6137.5137.6137.6137.5
4′129.3128.3129.3140.6140.7122.5128.3127.6127.7128.4
5′123.3123.9123.496.896.8125.0123.8124.5124.5123.9
6′187.2187.6187.238.238.4124.0187.4187.9187.8187.3
7′126.3126.1126.243.643.3129.2126.1126.1126.2126.1
8′171.0170.4171.135.735.445.5171.2171.7171.6171.7
9′40.139.740.832.733.038.240.040.039.940.0
10′151.8151.0151.842.239.3143.8151.1150.5150.5151.2
11′34.334.334.3151.2150.936.634.034.234.234.0
12′30.030.229.8 1108.6108.836.429.829.9 129.9129.9
13′39.040.239.019.920.037.539.039.039.039.0
14′44.744.3144.919.019.138.244.744.744.944.7
15′28.628.428.612.512.428.328.528.528.528.5
16′36.435.536.4 35.436.436.436.436.4
17′30.538.230.5 30.430.530.530.530.5
18′44.343.544.3 44.444.244.344.344.2
19′31.132.031.1 29.830.830.930.830.9
20′40.641.940.7 40.640.440.440.440.5
21′29.7 1214.729.7 2 29.829.529.9 129.829.7
22′35.052.635.0 35.834.734.734.835.0
23′13.312.813.3 10.813.213.013.013.2
24′
25′37.638.937.7 22.337.737.637.637.7
26′20.920.820.8 17.520.920.820.820.9
27′18.519.718.6 17.018.418.318.318.5
28′31.632.631.6 31.831.531.631.631.6
29′179.3 179.4 179.3178.8178.7178.8179.1
30′32.915.133.0 31.832.732.732.732.9
OCH351.6 51.8 51.551.451.651.651.4
Ref[136][136][137][128][128][128][140][136][137][137]
C D44 D45 D46 D47 D48 D49 D50
1115.2114.6115.5115.5108.2108.2128.3
2190.2189.4190.2189.5144.5144.5183.6
392.091.192.092.0140.7140.796.9
479.477.279.479.4122.8122.992.3
5129.8131.8130.3130.2124.7124.739.5
6126.8128.9126.6126.571.471.428.1
7116.1117.2116.2116.374.174.132.8
8161.5164.4160.4160.543.643.630.4
942.044.041.741.840.4 140.4 143.7
10174.3173.2173.7173.6143.7143.7140.7
1132.932.833.232.834.534.535.4
1229.529.6129.829.530.230.230.6
1338.138.639.438.540.6 140.6 144.5
1444.744.444.344.240.4 140.4 140.5
1528.428.628.328.429.329.330.0
1636.336.435.435.535.535.536.4
1730.530.538.237.137.937.940.5
1844.144.343.443.643.843.743.7
1930.930.832.134.2 131.931.943.7
2040.440.441.953.642.242.2151.2
2129.830.1 2213.6209.4214.7214.6 239.0
2234.734.752.551.953.953.938.2
2322.224.622.322.311.311.312.6
24
2534.939.135.635.229.129.1
2622.522.422.322.815.715.719.1
2718.718.220.018.219.319.232.1
2831.631.632.632.633.133.120.5
29178.9178.8 175.1 108.7
3032.732.815.125.115.215.219.9
OCH351.651.6 52.6
1′111.4110.5111.4111.4109.7109.7109.2
2′144.7145.2144.7144.6141.5141.4145.0
3′137.7137.6137.7137.6140.3140.3142.8
4′127.8128.6127.8127.8121.8121.8122.4
5′124.5123.9124.5124.5124.3124.3125.7
6′187.7187.2187.7187.7119.7119.8124.4
7′126.1126.2126.2126.1138.2138.1128.7
8′170.4169.9170.8170.743.943.945.5
9′39.739.739.839.8142.8143.037.3
10′150.4151.1150.3150.4131.8131.8143.3
11′34.534.334.134.3 1122.7122.631.2
12′30.230.1 229.930.137.537.430.0
13′40.140.139.240.240.140.138.9
14′44.043.944.344.340.740.4 138.9
15′28.228.228.628.424.023.628.1
16′29.629.5 135.735.535.929.536.4
17′44.944.937.138.239.245.330.4
18′45.045.043.943.545.746.744.5
19′32.031.934.232.032.532.130.6
20′40.940.953.641.942.441.340.5
21′213.7213.6209.4213.7214.9214.5 230.0
22′76.576.751.952.651.275.436.0
23′13.013.213.013.010.710.710.8
24′
25′38.738.938.238.422.422.422.1
26′20.920.921.220.819.619.816.9
27′20.620.717.819.720.621.417.4
28′25.025.032.632.631.524.231.8
29′ 175.0 179.2
30′14.814.725.115.115.415.032.1
OCH3 52.5 51.6
Ref[137][137][137][137][141][141][142]

Ref: References; 1,2,3,4,5,6,7,8,9,10: Values bearing the same superscript are interchangeable; 11: Signal bearing this superscript was superimposed on solvent signals; Solvent: CDCl3; 13C-NMR data for D4, D5 and D29 were reported by Gonzalez et al. [143] but the chemical shifts were not attributed to each carbon atom.

Table 5

13C-NMR data of lupane-type pentacyclic triterpenoids isolated from Celastraceae species (2001–2021).

CL1 +L2L3L4L5L6L7L8L9L10
138.438.741.8123.642.139.639.679.539.839.3
223.727.434.0165.134.234.134.142.934.334.3
380.979.0218.3205.3218.8218.0217.7216.1218.2221.4
437.938.947.545.047.647.347.247.147.550.7
555.455.254.652.954.854.954.951.255.155.3
618.218.319.418.919.619.619.619.619.819.2
734.334.333.934.534.333.533.632.933.733.6
840.940.842.242.942.440.840.641.041.040.7
949.950.054.548.954.949.349.850.650.049.5
1037.137.138.040.638.236.836.945.137.036.6
1120.920.870.170.670.521.421.522.921.621.7
1227.6 *26.537.237.337.424.825.125.125.025.2
1337.937.836.137.137.237.437.737.937.837.5
1443.142.942.242.842.644.141.942.942.842.8
1527.227.226.827.327.436.826.927.527.327.0
1635.335.333.635.335.476.933.135.535.934.0
1743.043.147.343.043.048.680.242.942.047.8
1849.047.147.847.547.647.648.347.9 *48.248.6
1942.837.447.447.747.747.548.048.2 *60.047.8
2049.049.7149.5150.2150.2149.9149.6150.7148.4150.3
2125.2 *23.629.429.729.829.829.429.877.929.7
2240.040.528.839.839.837.738.540.049.629.1
2328.028.027.221.427.526.626.628.026.822.1
2416.615.420.528.220.821.021.019.821.265.3
2516.1 **16.016.519.916.716.016.011.916.117.0
2616.0 **15.916.617.416.915.815.915.916.015.6
2714.414.314.414.414.416.113.814.414.614.7
2818.017.960.318.018.111.7 18.119.860.5
29207.07.3110.1113.5109.9109.8109.6109.5111.5109.8
3014.5205.118.919.319.419.319.319.319.919.1
COOCH321.3
COOCH3171.0
Ref[144][145][146][147][148][149][145][150][14][151]
C L11 L12 L13 L14 L15 L16 L17 a L18 L20 L21
139.639.6125.239.840.239.734.142.439.753.5
234.134.1159.234.035.734.326.634.334.2211.4
3218.2218.0205.0218.0216.5218.375.1218.6217.982.5
447.347.444.647.347.747.538.147.647.445.6
554.955.053.554.855.455.149.254.955.154.6
619.619.619.019.020.419.818.519.519.718.5
733.533.533.733.534.233.834.534.233.734.0
840.942.741.840.941.541.041.142.140.841.3
949.749.644.549.749.850.050.854.749.750.4
1036.836.939.536.837.737.037.738.236.943.9
1121.421.421.221.322.221.720.870.121.521.0
1226.827.625.225.228.226.826.137.627.625.1
1337.337.137.537.438.038.335.237.637.937.2
1442.740.843.042.843.543.041.442.342.842.8
1527.026.927.027.028.227.628.228.827.427.1
1633.829.129.129.134.535.622.928.935.429.3
1747.848.047.747.737.643.254.059.343.347.8
1849.352.348.648.650.449.055.559.347.748.7
1943.536.547.847.352.843.992.247.247.747.8
20154.4157.0150.3150.0211.5154.9141.4149.1157.2150.2
2129.132.829.729.727.831.934.429.832.729.7
2231.733.933.933.940.440.029.332.940.033.8
2326.726.621.426.627.126.829.220.726.629.1
2421.121.127.821.021.321.222.827.421.116.4
2516.015.919.215.816.116.116.516.815.917.0
2615.815.816.515.914.816.015.716.715.814.8
2714.714.614.614.716.414.613.614.114.415.6
2860.260.260.660.518.317.9178.6206.017.860.5
29107.2133.2109.9109.7 106.9112.3110.7133.0109.9
3065.0194.919.019.629.365.219.319.0195.019.1
Ref[152][153][151][149][14][14][153][151][148][73]
C L22 L23 b L24 L25 L26 L28 L29 L30 L31 L32
134.035.433.653.438.638.626.338.653.538.7
222.923.725.9 *211.524.027.423.127.3211.426.9
378.280.376.482.981.078.976.078.882.978.9
436.737.737.545.638.338.936.438.845.638.8
550.351.649.9 **54.655.655.352.455.154.655.3
618.019.218.418.518.418.320.918.218.518.2
734.435.334.433.834.234.333.034.133.834.3
840.942.241.041.241.240.643.140.743.940.8
950.751.550.5 **50.450.550.445.750.250.450.4
1037.238.337.344.037.337.239.837.141.337.1
1120.821.920.821.121.121.023.620.821.020.8
1227.228.825.6 *24.825.427.325.827.225.027.4
1339.839.238.737.937.336.638.336.237.238.5
1444.043.942.642.942.941.840.342.542.842.5
1528.128.529.529.427.326.827.826.927.029.2
1632.136.428.835.429.332.835.628.829.131.7
1754.344.359.342.948.080.343.047.847.759.3
18143.852.048.0 ***48.249.049.248.349.648.648.6
19139.238.347.5 ***47.2948.052.247.952.047.743.2
20207.2158.3149.8150.7150.7212.2150.9213.548.6154.1
2134.833.430.029.830.027.529.927.629.728.9
2235.140.933.229.934.438.740.033.933.932.9
2327.728.328.229.228.228.029.627.929.328.0
2421.722.222.216.416.915.424.015.416.315.3
2516.516.515.9 ****17.016.416.2101.416.017.015.9
2616.116.716.1 ****15.616.216.016.215.915.616.1
2715.715.114.214.515.013.214.714.614.714.3
2866.018.3205.618.060.8 18.060.560.5206.3
29 134.8110.1109.5109.9 109.3 109.9107.4
3030.7197.319.019.319.329.919.329.419.165.0
OCH321.421.3 54.6
C=O170.8173.4 167.7
1′ 126.7
2′ 130.1
3′ 115.8
4′ 159.3
5′ 130.1
6′ 130.1
7′ 116.3
8′ 144.5
Ref[154][154][155][73][156][145][54][157][158][145]
C L33 a L35 c L36 L37 L38 L39 L40 L41 L42 L43
139.338.478.738.438.438.638.653.538.738.7
228.323.84.223.923.827.327.4211.527.327.4
378.081.377.655.480.678.978.982.978.979.0
439.338.1NR38.137.938.838.845.638.838.9
553.255.453.155.455.455.255.254.655.555.3
630.318.217.818.218.218.218.318.518.218.3
774.434.134.034.234.334.234.233.834.334.3
847.241.941.440.940.940.740.741.240.840.8
951.150.351.450.350.450.350.250.450.450.2
1037.637.143.537.137.137.137.244.037.137.1
1121.321.823.821.021.020.720.921.120.720.9
1226.325.125.025.125.127.527.324.925.527.6 A
1339.337.338.138.138.137.237.037.938.737.7
1444.042.737.643.0 *42.942.342.742.942.542.7
1534.027.027.527.427.529.027.427.429.2 *27.3
1632.829.235.635.635.628.735.035.528.8 *35.4
1726.748.242.942.8 *43.059.343.043.059.343.3
1849.748.848.348.348.348.049.748.248.0 **51.2 B
1947.747.748.047.748.051.152.647.947.5 **36.7 C
20151.1150.4150.8151.0151.0211.8212.9150.8149.7157.0 B
2130.929.729.829.929.927.627.629.829.832.6 B
2237.234.040.040.040.032.439.839.933.239.9
2328.528.027.828.028.028.028.029.327.928.0
2416.416.716.216.716.615.415.416.415.415.4
2516.316.212.016.2 **16.216.116.117.015.9 ***16.1
2610.916.016.216.0 **16.015.815.915.616.1 ***15.9
2715.114.814.414.514.514.214.514.514.214.4
28176.660.617.918.018.0206.118.018.0205.617.8
29110.0109.8109.4109.4109.430.229.2109.5110.1132.9 B
3019.519.119.219.319.3 19.319.0195.1
1′ 127.3167.6127.1173.7
2′ 115.3115.7115.134.9
3′ 144.2145.1144.925.2
4′ 146.8127.4147.329.2
5′ 114.2114.4113.929.3
6′ 122.3144.0122.029.4
7′ 144.9146.6144.929.6
8′ 115.8115.5115.729.7
9′–14′ 168.0122.4167.729.7
15′ 29.5
16′ 31.9
17′ 22.7
18′ 14.1
Ref[153][159][160][159][161][145][145][162][155][163]
C L44 L45 L46 L47 L48 L49 L50a L51 L52 L53
142.542.542.142.138.440.942.638.440.139.8
234.434.434.434.527.7178.5174.436.234.534.3
3216.8216.8216.7216.881.0187.5182.4217.2216.3218.3
448.948.948.949.037.845.646.947.042.247.0
556.656.656.556.655.448.248.449.656.555.1
669.769.769.669.718.221.321.619.969.819.8
742.142.142.242.234.233.733.833.541.937.2
840.740.740.040.040.941.841.140.837.540.8
950.650.650.650.550.441.742.052.450.9 *50.0
1036.836.836.736.737.140.742.336.634.537.1
1121.821.821.321.321.019.222.221.721.321.5
1228.728.726.729.725.124.927.326.025.225.7
1336.836.837.136.838.137.938.638.637.538.6
1443.943.942.943.242.843.243.542.742.942.6
1527.727.727.427.427.527.527.931.129.929.8
1635.635.635.335.335.635.535.632.632.232.2
1744.644.643.143.043.043.243.256.456.956.5
1848.548.548.950.648.348.448.947.549.5 *49.3
1950.150.143.742.148.048.043.849.647.047.5
2073.473.4154.6157.2151.0150.9156.5151.1150.3150.5
2129.129.131.732.730.029.832.230.030.730.7
2240.240.239.839.840.039.940.037.337.033.8
2324.924.925.025.027.129.827.868.025.726.8
2423.723.723.723.716.221.324.817.221.321.2
2517.517.517.016.916.520.820.416.017.3 **16.1
2617.017.017.117.116.015.916.315.917.1 **16.0
2715.215.214.814.714.514.615.014.615.014.8
2819.219.217.717.818.018.017.9178.6181.9181.2
2931.731.7106.9133.2109.4109.4105.9109.6109.8109.9
3025.225.265.0195.119.319.264.319.319.519.5
C=O 171.0
OCH3 21.3
Ref[164][164][146][146][165][73][153][166][167][14]
C L54 L55 L56 L57 a L58 d L59 a L61 L62 L63 L64
139.633.934.034.034.038.7159.938.775.975.9
234.128.126.226.725.128.4125.127.436.436.4
3218.2179.175.075.376.978.2205.679.076.676.9
447.3147.538.138.238.539.444.638.837.437.5
554.950.446.449.354.956.053.455.347.847.9
619.624.526.118.718.018.919.018.318.418.5
733.632.876.734.733.934.933.734.334.034.1
840.740.946.341.241.241.241.740.842.941.7
949.640.451.250.549.951.044.450.451.251.3
1036.839.237.837.736.737.639.537.137.443.7
1121.521.420.821.220.521.321.221.023.723.9
1229.725.426.528.227.126.225.126.725.225.2
1337.838.339.138.237.639.638.238.036.937.7
1442.842.844.443.142.642.943.043.041.742.9 *
1527.330.633.027.831.731.327.427.427.127.5
1635.432.133.435.936.433.035.535.529.235.7
1743.156.556.343.555.556.743.142.843.643.0 *
1850.949.449.651.346.747.948.148.948.848.1 **
1940.746.948.041.448.749.947.343.847.848.4 **
20146.3150.4151.4149.2150.4151.4150.8154.8150.3150.8
2132.929.731.233.530.130.429.831.829.729.8
2239.736.937.740.238.337.740.039.834.040.0
2326.6113.429.029.428.128.827.828.027.727.6
2421.023.222.422.715.816.421.416.121.922.0
2515.920.116.116.315.916.519.216.011.711.5
2615.815.912.116.416.016.516.415.416.216.1
2714.414.615.114.814.415.014.414.514.814.6
2817.9176.6179.018.2177.3178.918.017.760.618.1
29124.9109.7109.9122.4109.6110.0109.5107.6109.8109.5
30171.219.319.5170.319.019.619.365.019.019.3
OCH3 51.3 51.3
1′ 166.3
2′ 117.6
3′ 156.4
4′ 27.0
5′ 20.2
Ref[146][118][153][154][168][169][170][145][146][150]
C L65 L66 L67 L68 L69 L70 L71 L72 L73 L74
179.044.539.539.635.535.433.532.539.038.9
237.571.334.134.225.625.628.225.327.527.4
375.778.5217.8218.175.975.976.076.478.678.9
438.938.247.347.337.837.838.837.639.438.8
553.155.254.954.948.948.948.548.255.654.9
618.018.119.619.718.018.321.118.418.118.5
734.134.233.233.635.135.134.234.435.337.8
841.340.940.940.842.642.740.941.141.142.5
951.450.949.649.855.655.650.450.555.751.0
1043.536.936.836.939.139.137.337.337.737.4
1123.821.121.221.570.570.620.821.270.521.0
1225.025.225.325.237.637.625.225.327.725.2
1338.038.037.338.236.337.137.138.037.737.6
1442.842.942.742.942.942.742.743.042.647.9
1527.427.326.927.427.027.327.127.627.569.7
1635.535.634.835.533.835.429.235.835.546.5
1742.943.037.843.047.843.048.143.243.043.0
1848.348.347.048.348.247.747.848.247.748.1
1947.948.059.048.047.647.748.048.247.447.4
20150.8151.0143.4150.6149.8150.2150.4151.2150.2150.4
2129.729.9217.729.929.129.829.829.929.930.1
2239.940.055.440.029.339.834.040.239.939.7
2327.829.626.626.722.322.328.128.228.327.9
2414.917.121.021.028.728.716.022.415.615.4
2511.917.115.916.016.316.216.116.416.116.1
2616.216.015.715.817.217.216.116.217.316.6
2714.414.514.514.514.114.614.814.714.58.0
2818.018.018.718.060.218.060.118.218.119.2
29109.4109.3115.0109.4110.2109.8109.6109.6109.8109.7
3019.219.320.819.319.119.318.919.519.419.4
Ref[171][172][40][145][151][147][173][174][175][176]
C L75 L76 c L77 L78c L79 L80 L81 L82 L83 L84
138.738.734.238.238.738.940.738.738.440.7
227.327.527.230.627.027.529.727.427.027.6
378.378.979.082.379.078.879.178.876.879.1
438.838.738.940.938.938.839.638.341.939.6
555.655.255.459.555.355.455.655.249.955.5
618.218.318.222.018.318.369.018.318.469.1
734.134.534.137.534.233.442.134.234.042.4
840.841.340.842.740.940.939.940.940.840.4
949.450.250.454.550.450.451.950.350.450.9
1036.837.042.632.237.137.236.737.137.036.6
1121.421.420.824.720.821.021.120.921.421.6
1224.827.425.330.825.126.725.325.126.628.8
1337.437.437.941.337.338.037.238.037.936.6
1444.144.642.944.842.742.843.042.842.843.8
1536.827.727.233.027.327.527.527.427.427.5
1676.935.535.338.029.235.535.535.535.435.5
1748.643.542.846.447.843.043.142.943.044.6
1847.648.348.253.348.748.948.448.248.848.4
1947.449.947.847.447.843.848.047.943.849.9
20150.073.5150.4150.7150.5155.2150.9150.6154.773.5
2129.829.029.735.429.831.829.929.831.729.2
2237.740.240.033.133.939.940.039.939.840.2
2328.028.028.031.227.928.127.628.072.127.7
2415.015.415.619.315.315.416.615.411.216.9
2516.016.160.718.616.116.017.716.116.517.8
2616.016.116.219.215.916.116.915.916.017.2
2716.014.814.817.814.714.614.914.514.615.2
2811.619.218.162.960.617.718.018.017.719.2
29109.624.7109.9109.8109.7106.4109.4109.2106.824.8
3019.031.519.267.819.064.619.319.365.031.6
Ref[149][177][178][157][179][148][151][180][145][146]
C L85 L86
140.739.5
227.534.0
379.1217.8
439.647.2
555.654.7
668.919.6
742.033.4
840.040.8
951.049.2
1036.736.8
1121.021.2
1225.326.5
1336.437.7
1442.943.0
1527.127.7
1633.634.5
1747.743.8
1848.852.2
1947.745.0
20150.4139.1
2129.782.2
2229.147.7
2327.626.7
2416.921.0
2517.715.9
2616.915.7
2715.114.1
2860.419.3
29109.7124.7
3019.1171.2
Ref[151][181]

Ref: References; + 13C-NMR data of acetylated compound, *, **, ***, **** Values bearing the same superscript are interchangeable; NR: Not reported; Solvent: CDCl3; a Pyridine-d5; b CD3COOD; c CD3OD; d DMSO-d6; A Slightly broadened peak, measured at 25 °C; B Broad peak, measured at 35°C; C Very broad peak, determined from HSQC and HMBC spectra at 35°. 13C-NMR data for L19, L27 [159], L34, L60, L87 [182,183], L88 [182,183] and L89 were not found. These compounds were identified on the references cited here by comparison of spectroscopic data with those reported in the literature, but we could not get access to the original papers.

Table 6

13C-NMR data of oleanane-type pentacyclic triterpenoids isolated from Celastraceae species (2001–2021).

CO1O2O3O4O5O6O7O8O9 aO10 a
138.732.841.140.333.839.340.340.339.072.3
233.826.632.834.425.527.334.434.234.235.5
3216.275.9217.4218.076.178.6218.2217.8215.972.3
447.537.447.747.737.539.047.847.747.640.1
554.748.254.955.548.855.055.455.354.547.8
618.717.519.719.818.318.219.819.719.217.8
730.531.132.833.933.233.132.732.630.932.8
840.640.741.942.943.343.043.243.241.745.2
950.150.455.550.451.251.648.748.552.853.8
1036.236.637.637.738.338.137.637.536.342.1
1152.557.067.976.375.975.881.782.0132.3200.9
1257.052.9125.5121.6122.5121.5122.3121.2131.3128.6
1387.387.9149.0149.3148.3149.7150.8152.884.9169.7
1441.241.343.242.041.841.742.042.344.244.0
1526.726.726.426.226.126.126.327.925.726.7
1621.221.626.026.828.126.628.126.626.026.5
1743.843.732.332.434.832.334.933.141.932.5
1849.649.146.747.246.346.846.547.051.147.6
1937.832.546.346.446.746.346.946.732.445.2
2031.536.831.031.136.331.136.531.136.731.0
2134.329.734.634.773.934.574.034.630.934.5
2227.027.736.836.945.236.845.236.930.636.7
2325.928.026.726.728.628.026.726.926.228.8
2421.121.821.521.522.415.421.621.521.016.2
2516.417.016.216.416.718.016.418.017.318.0
2618.720.117.918.118.216.818.216.219.419.1
2719.818.126.125.225.225.124.724.719.623.6
28179.2179.128.428.528.428.328.528.577.128.8
2933.226.633.033.228.933.129.133.228.933.0
3023.665.723.623.616.923.517.023.665.023.5
OCH3 53.753.753.7
Ref[184][185][186][104][187][188][187][187][189][190]
C O11 O12 O13 O14 O15 O16 O17 O18 b O19 a O20
139.639.439.340.038.139.848.647.647.746.6
233.834.234.234.524.034.069.169.668.769.0
3218.1217.7217.8217.580.3218.383.185.985.784.0
447.047.547.548.137.547.239.344.343.939.3
554.655.455.355.755.054.855.557.356.555.4
619.419.719.619.118.819.617.719.819.218.4
733.732.232.132.332.233.734.034.333.533.1
840.639.939.745.239.640.643.540.940.039.4
950.146.946.861.347.250.456.849.248.347.6
1036.736.736.737.038.036.840.139.238.338.3
1121.323.823.7199.323.321.572.325.124.223.6
1225.7123.6122.4128.2123.126.0211.1124.6122.4124.5
1337.6142.5143.8168.9142.638.982.4144.4144.4140.5
1443.641.941.843.841.843.245.342.542.142.6
1527.325.626.026.125.227.322.630.329.124.4
1636.323.628.230.918.036.830.527.923.125.3
1736.939.635.037.331.734.533.647.047.035.3
18142.948.046.743.046.1147.549.045.041.843.5
19127.741.447.045.540.0124.738.582.346.233.9
2040.0151.636.331.342.628.031.435.930.839.6
2173.169.174.034.136.627.934.129.434.039.9
2243.545.945.321.875.237.339.033.132.283.2
2326.626.626.521.723.826.828.723.824.228.7
2420.721.621.526.716.520.916.666.165.716.9
2516.315.315.216.015.316.517.217.517.317.0
2615.716.816.718.716.515.920.717.717.417.1
2713.925.825.823.725.914.518.525.126.124.1
2826.768.828.369.624.925.531.3178.6176.625.0
2928.5 29.123.6177.970.525.128.633.2182.5
3021.4103.616.933.220.325.631.925.223.821.1
OCH3 51.7
1′ 173.5 93.993.7
2′ 34.6 78.678.6
3′ 23.3 78.079.0
4′–11′ 28.9–29.4 70.870.6
5′ 78.879.2
6′ 62.262.0
1″ 103.4104.6
2″ 75.776.0
3″ 77.878.4
4′’ 72.572.7
5″ 77.978.4
6″ 63.763.8
12′ 31.7
13′ NR
14′ 13.9
Ref[191][61][96][192][68][191][193][194][194][61]
C O21 O22 a O23 O24 O25 O26 O27 O28 a O29 O30
179.640.039.534.733.434.139.1212.940.338.7
244.534.434.329.425.422.727.345.423.923.8
3172.4215.9218.198.075.878.078.779.080.281.2
456.047.847.640.037.536.739.240.138.337.1
585.055.155.350.248.449.755.054.955.256.0
633.219.019.919.417.417.717.518.117.718.2
727.632.132.830.832.632.532.934.434.035.1
843.245.340.038.543.543.546.340.744.140.3
955.261.246.941.661.661.660.442.854.250.5
1044.537.036.935.037.137.037.453.539.337.1
1167.3198.923.923.6200.3200.1195.324.475.324.8
12133.5128.4124.7122.3128.3128.2142.826.7202.2124.2
13139.8170.6140.5143.4169.4169.3138.339.683.2144.1
1442.643.742.941.645.645.641.543.744.842.1
1519.826.725.425.825.725.826.527.822.927.2
1634.126.924.528.022.021.526.731.339.127.5
1751.432.535.536.037.037.031.332.533.532.0
1837.847.343.747.042.742.738.7140.749.147.4
1940.540.840.046.544.945.041.3132.638.346.9
2047.736.039.736.031.031.030.932.531.531.1
21215.929.939.773.833.933.834.733.434.534.8
2240.436.483.345.030.630.636.931.130.037.2
2321.021.527.027.028.428.028.028.628.228.0
2420.326.521.718.022.321.915.516.616.416.6
2513.815.915.267.716.316.316.516.116.415.5
2619.118.516.717.018.618.618.717.020.916.5
2722.623.425.325.123.623.523.215.118.925.7
2826.828.724.228.169.769.729.263.631.428.7
2928.428.2182.716.632.932.933.131.432.333.2
3021.365.321.228.823.423.423.429.724.523.7
OCH3 21.7 21.4
C=O 170.7 171.2
1′ 129.7127.4
2′ 130.1115.4
3′ 128.6144.1
4′ 133.2146.6
5′ 128.6114.3
6′ 130.1122.2
7′ 165.6144.8
8′ 116.0
9′ 167.8
Ref[117][190][195][196][154][154][54][190][197][198]
C O31 O32 O33 O34 O36 O37 O38 O39 O40 O41
138.138.638.453.539.238.638.738.542.242.0
224.423.723.7211.126.427.227.322.534.434.1
380.780.680.683.178.378.979.080.8216.7216.5
437.680.637.845.939.338.738.837.849.048.7
551.355.655.454.855.055.255.355.556.456.2
618.218.218.318.817.518.318.518.569.769.4
732.134.932.733.032.833.132.832.842.242.0
838.040.839.940.143.439.338.839.739.939.6
9153.951.147.747.761.847.547.747.851.351.1
1040.737.236.943.837.137.037.637.136.836.6
11115.921.123.623.7200.223.523.623.921.421.2
12120.726.2121.8124.1128.3124.6121.8121.926.126.0
13147.238.4145.2140.7170.4140.2145.1145.438.137.4
1442.843.341.842.945.439.541.841.943.543.3
1525.627.526.224.526.425.226.226.427.527.4
1627.237.727.025.427.324.327.026.036.937.3
1732.034.332.535.532.335.232.532.734.534.2
1845.6142.747.443.647.643.447.447.4147.6142.4
1946.8129.846.940.045.239.846.947.0124.9129.8
2031.132.331.139.731.042.531.131.337.432.1
2134.633.434.834.034.433.834.823.928.033.0
2237.137.437.283.236.583.137.2121.937.437.1
2328.728.028.129.628.728.128.2145.425.123.4
2416.916.616.816.816.415.615.541.923.624.8
2520.016.715.616.715.715.615.626.417.316.9
2621.016.116.916.918.717.016.926.017.717.6
2725.314.526.024.323.425.026.032.714.914.5
2828.225.328.425.228.224.028.447.425.525.0
2933.231.333.3182.533.0182.433.347.070.531.2
3023.729.223.721.223.521.023.731.325.729.0
1′127.8173.7173.5 173.9
2′115.534.534.9 35.0
3′143.825.225.2 25.4
4′146.229.229.2 29.4–29.9
5′114.329.329.3 29.4–29.9
6′122.429.329.4 29.4–29.9
7′144.429.729.6 29.4–29.9
8′116.429.729.7 29.4–29.9
9′–13′167.429.729.7 29.4–29.9
14′ 29.729.7 31.2
15′ 29.729.5 23.0
16′ 31.931.9 14.4
17′ 22.722.7
18′ 14.114.1
Ref[198][161][199][166][200][111][201][202][191][191]
C O42 O43 c O44 O45 O47 d O50 O51 a O52 c O53 O54
138.942.540.6128.440.139.347.834.641.540.1
234.035.334.8143.935.034.268.642.2175.237.4
3216.9217.0218.6201.2219.0217.983.876.6180.3213.6
447.148.648.444.048.047.539.837.246.044.8
552.456.855.953.956.055.355.948.548.953.6
630.320.920.118.820.319.718.937.920.723.9
772.932.231.532.726.732.133.218.132.131.6
843.344.344.440.540.539.848.232.839.339.1
946.955.450.743.147.546.848.243.239.445.3
1036.738.938.138.437.836.738.655.641.636.7
1123.568.376.623.624.023.723.567.123.922.0
12122.5128.7122.8123.0123.4123.3122.5126.1124.6122.5
13143.8147.2148.9143.4143.5143.2144.9147.7140.1143.8
1445.343.042.241.943.441.942.241.443.341.8
1529.227.326.525.726.325.428.325.124.427.6
1622.328.027.228.129.022.223.726.525.323.0
1736.733.132.337.439.536.946.731.535.446.5
1843.049.048.143.949.841.141.747.043.641.3
1946.443.342.639.944.239.942.030.939.845.8
2031.044.843.342.546.042.431.043.539.630.7
2134.134.233.336.240.628.534.330.933.933.8
2230.839.538.675.878.729.833.338.083.232.4
2326.427.427.027.326.621.629.428.428.5116.0
2421.522.221.921.921.726.616.922.123.4
2515.017.016.720.015.515.317.516.419.213.1
269.718.918.417.517.216.717.717.817.217.0
2725.926.325.525.426.225.426.226.523.725.8
2869.629.329.019.925.869.0180.228.425.2180.4
2933.129.329.3184.034.3184.533.328.0182.433.0
3023.8178.9183.323.8181.019.223.8179.220.723.5
OCH3 54.1 52.2
Ref[154][203][203][61][204][61][157][205][61][166]
C O55 O56 O58 a O60 a O61 O62 a O63 b O65 b O67 a O68
136.839.633.638.933.637.938.238.938.938.5
232.434.426.228.126.225.126.628.227.626.7
3217.7217.875.278.070.881.979.779.673.778.7
439.147.737.839.7 *47.455.438.040.142.938.6
555.355.649.155.849.146.948.056.548.855.1
619.520.018.618.819.720.319.519.018.718.2
733.832.532.933.232.732.633.733.433.632.5
839.340.140.337.3 *39.839.939.641.239.839.7
947.447.147.748.146.747.149.648.948.247.5
1046.937.037.337.937.637.939.937.837.336.8
1123.624.023.823.823.523.520.224.423.823.4
12122.4123.0123.2122.7121.7120.9124.3123.5122.7123.1
13143.6144.3144.4144.7145.1143.0144.7144.5145.0143.2
1441.742.142.042.241.942.043.243.542.241.5
1532.227.325.928.326.035.924.726.528.425.2
1621.426.323.024.026.973.127.929.023.821.8
1746.632.737.646.632.548.641.239.546.736.7
1841.046.441.741.647.341.256.649.942.041.1
1945.840.541.442.046.747.540.044.346.540.1
2030.742.842.835.931.130.943.946.231.042.1
2132.429.229.529.634.735.876.040.734.328.4
2226.436.130.832.937.132.841.578.833.329.7
2327.726.829.228.4183.2206.428.728.368.227.9
2415.021.722.716.524.210.217.416.113.115.4
2515.015.515.715.313.115.416.115.716.015.3
2617.017.017.017.416.717.216.317.317.516.5
2725.826.126.026.225.927.126.726.326.225.7
28183.928.468.3180.228.4174.821.025.8180.468.6
2933.0185.1181.528.233.333.2182.334.133.3181.7
3023.519.420.165.523.724.525.2181.123.819.1
Ref[166][102][61][206][207][208][209][204][157][61]
C O69 b O70 O71 a O72 a O73 O75 a O76 O77 O81 O82
142.038.1213.038.538.549.638.378.734.932.5
228.023.445.428.027.4170.623.5172.225.226.0
380.081.078.478.178.7182.080.8110.976.076.1
439.737.740.039.538.745.437.936.437.437.3
557.155.454.755.355.255.255.248.848.747.3
668.718.218.218.818.320.718.317.618.318.3
741.632.633.232.932.633.432.634.533.032.5
840.739.439.741.139.341.139.841.143.637.0
949.447.639.754.847.645.947.541.056.448.9
1037.637.052.737.137.038.536.840.138.233.0
1124.523.425.7126.023.174.523.722.167.623.4
12124.0122.6123.2127.0122.1121.4121.624.2126.1122.6
13144.4143.6144.1136.6143.4149.8145.2133.5148.0143.7
1443.341.642.542.541.643.141.745.241.841.7
1528.827.728.333.327.725.826.126.426.026.0
1624.122.923.725.623.427.526.939.328.032.5
1747.946.646.848.746.632.932.534.634.725.2
1841.941.042.3133.841.347.247.2133.945.835.0
1941.445.746.241.045.841.646.738.746.746.6
2036.830.731.032.830.636.131.133.336.350.0
2129.333.634.337.533.830.034.735.473.974.0
2233.132.533.236.332.336.637.136.445.136.3
2328.428.129.028.528.128.228.119.328.345.4
2417.617.216.816.015.623.316.824.322.328.2
2517.315.215.018.415.317.715.615.016.722.3
2618.816.718.117.116.817.116.918.118.116.8
2726.525.926.020.126.025.526.021.326.315.2
28181.8184.0180.1178.9181.028.428.423.828.526.0
2974.433.133.332.433.128.233.332.328.928.3
3019.523.623.824.423.665.623.724.016.929.0
1′ 167.1
2′ 116.2
3′ 144.6
4′ 127.1
5′ 109.2
6′ 146.8
7′ 147.8
8′ 114.6
9′ 123.0
OCH3 21.3 55.9
C=O 171.1
Ref[210][211][157][212][27][190][213][214][187][187]
C O84 O85 O86 O88 O89 O90 O91 O92 O93 O94
139.539.238.638.638.239.639.941.341.438.6
227.428.227.219.023.733.834.027.627.727.1
378.778.179.079.080.9218.0217.878.578.578.7
439.039.438.838.837.847.047.239.539.138.6
555.155.955.255.255.254.655.055.755.955.2
618.418.918.418.418.319.419.717.918.018.0
732.933.332.632.632.633.434.035.535.634.5
843.340.139.839.839.840.340.742.842.940.7
949.748.147.647.647.750.250.656.356.550.8
1037.937.336.936.236.933.737.039.439.536.9
1181.723.923.623.523.521.321.770.971.120.7
12121.2122.5122.3122.2121.725.926.338.338.625.7
13153.2144.9144.2144.8145.238.738.637.737.337.5
1441.842.541.741.741.742.543.442.843.043.5
1526.426.525.626.128.327.227.627.327.527.1
1627.428.722.027.226.233.937.731.537.636.4
1732.338.036.932.932.540.634.439.034.337.0
1846.945.442.346.347.3143.4142.6137.5141.6143.1
1946.946.946.529.046.8127.8130.0134.5129.9127.5
2031.230.931.041.031.245.132.432.232.437.0
2134.742.334.136.234.7215.233.433.233.473.1
2237.075.631.036.937.152.337.431.137.343.7
2328.228.815.515.628.024.526.928.228.227.7
2415.515.928.128.116.720.721.015.515.615.8
2518.316.615.515.515.613.316.016.817.416.4
2616.817.316.716.816.815.616.017.416.915.8
2724.725.825.926.025.914.714.514.414.313.9
2828.528.869.716.826.925.625.365.425.326.7
2933.333.333.226.933.328.831.329.731.328.5
3023.721.223.674.823.726.329.230.529.221.4
OCH3 21.3
C=O 171.0
Ref[215][216][217][218][219][191][220][191][220][191]
C O95 O96 O97 O98 O99 O100 O101 O102
138.940.838.538.831.638.834.838.3
227.427.527.427.925.927.933.022.7
378.979.179.078.675.778.6217.080.9
438.939.739.038.937.738.947.237.9
555.455.655.751.244.951.248.155.3
618.269.018.318.418.218.419.718.3
734.642.234.732.231.932.230.432.5
840.739.740.837.040.737.046.639.8
951.151.851.3154.3154.9154.353.747.5
1037.236.837.340.738.840.737.836.9
1121.021.221.2115.8115.3115.872.123.5
1226.126.226.2120.8121.4120.8120.5121.6
1338.837.639.0147.1145.2147.1152.8145.2
1443.243.543.442.842.842.841.741.7
1527.427.627.625.725.525.726.726.1
1636.937.337.727.328.527.326.626.9
1734.534.334.432.234.532.232.832.6
18147.8142.8142.845.644.945.648.047.2
19124.4129.9129.846.947.146.946.146.8
2027.132.332.331.136.331.131.131.1
2128.033.333.434.773.934.734.634.7
2237.540.837.437.245.337.236.937.1
2327.927.628.028.028.328.827.928.1
2415.416.815.416.622.415.119.416.8
2516.718.116.115.525.120.119.115.5
2616.117.516.716.520.921.099.116.8
2714.714.814.625.720.125.323.625.9
2825.525.225.328.728.628.328.728.4
2970.631.331.333.228.923.733.333.3
3025.729.129.223.716.933.223.723.7
1′ 127.3
2′ 109.3
3′ 147.0
4′ 146.6
5′ 114.8
6′ 120.8
7′ 76.4
8′ 76.0
9′ 62.9
OCH3 56.0
1′ 128.5
2′ 116.6
3′ 143.8
4′ 144.8
5′ 117.5
6′ 122.2
7′ 143.7
8′ 117.3
9′ 167.0
CH3 20.7
C=O 170.4
Ref[191][191][220][198][187][68][221][126]

Ref: References; * Values bearing the same superscript are interchangeable; NR: Not reported; Solvent: CDCl3; a C5D5N; b CD3OD; c CD3COCD3; d CD3OD; 13C-NMR data of some compounds were not found. In these cases, the reported identification was performed by comparison of other physical data: O59 [222], O74 (m.p., IR, MS, 13C-NMR of acetylated compound) [102], O78 (m.p., MS, 1H-NMR, UV, [α]D) [223], O79 (m.p., MS, IR, UV, [α]D) [224], O80, O83 and 087. 13C-NMR data of O35 [225], O46 [226], O48 [226], O49 [166], O57 [226], O64 [227], O66 [226] were reported, but the chemical shifts were not attributed to each carbon atom.

Table 7

13C-NMR data of ursane-type pentacyclic triterpenoids isolated from Celastraceae species (2001–2021).

CU1U2U3 aU4U5U6U7U8U9U10
141.441.142.540.840.841.439.239.039.047.2
234.234.535.127.427.734.334.528.328.369.1
3217.6220.9217.278.478.6217.6220.276.977.085.0
447.651.148.339.039.147.751.352.952.943.4
555.055.556.154.854.955.655.956.356.456.1
619.919.320.518.418.419.719.418.518.518.3
736.436.634.437.237.833.336.837.537.634.4
843.743.643.543.743.837.643.843.943.942.9
952.852.453.851.650.554.444.945.345.146.4
1037.737.338.538.438.343.137.638.538.539.2
1169.570.070.268.075.168.776.576.576.676.7
12146.3145.5148.4146.2145.0129.0142.9143.7143.9141.9
13115.1116.3113.2116.5123.1142.8119.1118.0119.1118.3
1446.846.944.246.647.242.546.646.546.540.6
1568.068.137.868.268.128.068.067.968.027.1
1638.138.965.938.738.826.639.038.238.927.5
1733.734.239.534.134.133.834.233.734.233.3
1842.047.549.946.146.758.547.542.247.547.7
1941.240.541.940.338.939.440.541.340.540.8
2071.639.340.739.639.539.539.371.439.339.5
2135.631.031.831.031.031.131.135.531.031.2
2235.741.036.841.141.141.341.135.941.241.6
2326.822.427.528.328.426.922.519.419.423.2
2421.465.922.115.815.821.265.9207.8207.765.6
2516.317.316.916.716.416.216.615.515.418.1
2618.518.318.918.719.217.518.318.718.718.1
2717.617.626.018.017.623.017.317.517.523.9
2829.029.323.629.329.228.729.128.829.028.5
2911.516.817.817.618.318.017.012.017.017.0
3029.821.022.021.021.121.521.129.921.121.2
Ref[193][193][190][54][54][228][193][193][193][193]
C U11 U12 U13 U14 U15 U16 U17 U18 a U19 U20
140.839.038.739.038.739.039.940.639.940.3
234.427.527.827.527.927.527.528.526.934.2
3218.378.680.478.680.578.778.777.978.9217.9
447.639.143.139.143.139.230.938.539.147.6
555.355.155.755.156.155.554.955.855.355.2
619.718.418.518.418.318.218.618.818.419.6
733.237.337.637.434.434.236.533.633.533.0
842.744.244.144.240.640.644.243.242.943.2
950.946.946.346.346.546.452.753.152.647.2
1037.638.438.138.538.138.438.139.738.237.3
1177.076.476.676.476.876.776.576.776.881.7
12124.2144.0143.0143.1142.1142.1125.2124.9124.1125.4
13143.3117.9119.1119.2118.2118.2144.1143.1143.6144.2
1442.446.446.446.442.942.947.742.241.544.2
1526.668.068.168.127.127.268.226.727.635.8
1627.938.038.838.727.627.638.823.728.166.7
1733.833.634.134.133.333.333.938.633.738.5
1858.842.247.547.547.747.758.753.858.660.3
1939.341.340.540.540.840.839.339.839.439.4
2039.571.539.339.339.539.539.139.439.639.2
2131.135.531.031.031.231.330.931.131.230.4
2241.335.941.241.241.641.641.036.142.135.0
2326.928.322.728.422.728.428.228.828.326.0
2421.415.864.415.864.515.815.616.615.721.4
2516.616.316.816.216.816.217.117.417.118.0
2618.218.718.618.718.018.118.918.318.316.2
2722.517.717.817.823.823.916.622.722.623.2
2828.728.729.029.028.528.529.369.128.821.9
2917.511.917.017.017.017.017.317.617.517.7
3021.329.921.221.221.221.221.321.621.521.2
OCH354.452.051.651.551.651.454.7 53.9
Ref[104][193][193][54][193][54][54][189][74][229]
C U21 U22 U23 U24 U25 U26 b U27 U28 U29 a U31
140.139.339.939.439.440.238.339.538.639.2
234.234.334.134.334.426.627.127.727.633.9
3218.0219.3216.7219.1219.483.178.979.673.1217.1
447.651.4447.751.551.544.338.840.043.147.5
555.355.655.155.755.748.454.556.248.254.4
619.718.719.018.818.718.817.918.818.019.1
732.435.635.535.735.634.635.132.731.634.4
843.046.246.646.346.344.243.043.142.142.9
947.858.759.158.758.749.652.753.753.552.1
1037.436.536.936.636.539.136.537.536.636.2
1181.8194.2194.4194.2194.278.4129.4132.9133.8129.0
12124.8145.1145.1145.1145.0145.8132.5131.5129.3132.8
13146.1132.9133.9133.9134.7116.985.885.884.985.6
1442.047.347.447.447.444.348.946.944.649.1
1527.968.168.368.368.336.468.436.025.868.3
1626.338.438.038.638.678.337.866.427.337.2
1733.833.933.734.134.239.742.748.442.542.3
1858.747.543.648.648.750.961.063.361.655.3
1939.435.541.434.840.642.137.639.337.938.8
2039.351.470.946.439.141.040.642.141.071.7
2131.125.335.424.930.932.531.230.531.735.9
2241.339.735.640.440.736.734.031.835.229.0
2326.522.126.422.122.067.427.728.467.426.0
2421.465.621.465.665.613.614.915.712.520.8
2518.116.715.816.616.717.617.718.418.517.1
2616.218.518.918.618.618.919.920.119.819.6
2722.015.415.115.115.125.212.819.017.412.5
2828.529.129.229.329.523.776.873.176.876.5
2917.517.411.616.216.617.618.118.918.412.9
3021.3176.429.765.720.921.719.419.819.528.7
OCH3 53.5
1′ 105.8
2′ 75.7
3′ 78.4
4′ 71.8
5′ 77.6
6′ 62.8
1″ 106.1
2″ 75.7
3″ 78.3
4″ 71.6
5″ 77.8
6″ 62.9
Ref[229][193][54][193][54][230][54][189][189][193]
C U32 U33 U34 a U35 U36 a U37 a U38 U39 U40 U41
140.940.939.547.148.047.938.639.839.833.5
228.227.434.268.668.768.823.825.934.225.3
376.978.7217.884.985.785.881.1NR217.175.8
452.839.047.443.443.943.938.138.747.837.5
555.854.755.255.556.556.655.456.755.448.3
618.618.519.617.619.119.318.318.818.817.4
735.635.032.333.133.833.932.934.332.232.7
843.844.740.045.540.240.740.241.343.745.3
952.755.746.859.548.248.047.749.460.861.4
1038.338.236.637.438.238.336.938.036.637.0
1170.067.823.3194.824.024.423.524.2199.0200.0
12146.1130.2125.3144.4125.7128.1125.1125.1130.6130.7
13116.1142.7138.4134.8138.7139.5138.9140.8164.8164.3
1445.947.042.241.742.442.142.243.345.543.7
1572.272.125.927.529.329.926.126.727.227.1
1634.234.523.327.324.425.923.724.127.427.5
1734.033.937.933.448.348.638.137.733.833.8
1847.458.354.048.953.354.554.255.358.858.8
1940.639.133.740.839.472.739.541.433.533.5
2039.339.246.739.339.242.239.540.746.546.5
2130.930.824.531.130.826.830.732.224.824.6
2240.740.734.741.136.437.535.336.540.540.5
2318.728.226.423.024.224.228.228.328.828.4
24207.615.621.565.365.765.717.017.522.122.3
2515.716.815.518.317.517.415.816.316.016.4
2619.218.616.718.517.417.216.817.318.418.5
2719.518.723.320.923.924.623.423.920.520.7
2828.928.969.628.8176.3177.169.970.528.728.7
2916.817.516.916.617.527.117.517.817.017.0
3021.021.266.321.021.416.721.421.665.965.9
OCOPh165.5165.6
iso 131.0131.0
orto 129.5129.5
meta 128.8128.4
para 132.9132.8
1′ 93.793.8127.2127.3
2′ 79.279.1114.0129.5
3′ 78.979.1144.8115.8
4′ 70.770.8147.2157.4
5′ 79.279.2115.3115.8
6′ 62.162.2122.1129.5
7′ 150.0143.8
8′ 115.7116.4
9′ 167.9167.2
1″ 104.8104.7
2″ 76.075.9
3″ 78.478.4
4″ 72.772.9
5″ 78.378.3
6″ 63.763.9
Ref[54][54][185][193][194][194][231][204][185][185]
C U42 U43 U44 U45 U46 U47 U48 U49 U50 U51 a
140.540.741.738.738.538.739.039.338.939.8
228.228.228.327.027.827.027.627.227.628.1
376.976.977.978.676.978.680.578.780.677.9
452.852.849.338.852.738.843.039.043.139.8
556.256.256.355.156.255.155.254.655.555.3
618.618.520.218.618.718.617.817.717.618.0
737.137.237.339.139.039.236.436.233.233.2
843.643.743.838.238.338.246.746.745.545.7
952.652.953.358.056.757.959.759.859.761.3
1038.238.338.438.138.338.137.037.336.937.4
1169.770.170.272.873.173.0194.9195.1195.1199.3
12146.5145.7145.7207.1206.7207.1144.9144.9144.5130.7
13115.1116.7116.642.742.943.0134.2134.0134.4163.6
1446.646.646.749.949.349.547.247.241.745.8
1568.068.168.166.066.166.268.368.427.537.1
1638.138.938.837.238.037.838.638.527.364.7
1733.634.234.132.633.233.134.234.233.439.2
1842.047.447.335.339.639.548.748.748.960.7
1941.340.540.541.440.540.540.440.440.839.1
2071.639.339.371.337.938.039.139.139.339.4
2135.631.031.035.230.830.830.930.931.230.8
2235.741.041.036.041.541.540.740.741.135.4
2319.319.323.827.819.227.922.428.022.428.7
24207.8207.9178.415.3207.115.264.315.664.316.6
2515.815.814.417.316.217.317.116.617.117.0
2618.718.618.521.220.921.119.019.118.418.7
2717.718.017.818.117.717.915.215.320.921.9
2829.029.329.327.928.228.229.429.428.823.0
2911.416.816.711.716.616.616.616.516.517.6
3029.921.121.029.120.520.520.920.921.021.2
OCH3 51.3
Ref[193][54][54][193][193][193][193][54][54][190]
C U52 a U54 U55 U56 U57 c U58 U59 U60 U62 U63 a
138.539.238.438.137.938.638.538.138.540.5
227.627.327.523.428.723.823.726.823.636.1
372.878.878.080.780.081.280.678.580.6216.0
443.139.142.337.942.837.937.838.737.754.7
548.154.854.655.052.555.555.354.655.349.2
617.917.519.317.718.518.418.317.518.267.8
733.032.833.331.433.333.132.931.032.941.6
842.145.140.941.839.940.240.141.540.042.6
948.961.651.153.048.747.847.752.847.646.6
1037.036.931.036.437.137.036.836.136.837.8
1137.4199.873.3133.424.423.623.4128.623.477.3
12209.8130.7126.0129.0128.0124.5124.4133.2124.3145.0
1389.4164.3140.489.7140.2139.8139.789.5139.6116.5
1445.943.642.542.041.742.442.141.742.141.4
1526.327.128.425.630.628.326.625.326.627.6
1626.427.526.030.927.626.828.122.628.128.0
1742.733.847.845.247.033.933.844.933.733.7
1855.058.853.540.454.659.359.160.459.147.5
1938.033.572.138.272.439.839.637.939.641.3
2040.746.542.560.739.739.839.740.139.740.0
2131.624.927.422.926.831.531.330.631.231.6
2234.940.538.331.338.541.741.631.141.542.2
2367.228.0180.627.868.428.328.127.628.166.8
2412.922.113.716.112.816.916.814.716.820.5
2516.116.516.719.217.016.015.717.715.717.6
2618.718.516.919.016.817.716.918.716.920.3
2717.720.623.916.225.023.423.315.923.224.0
2877.228.768.718.164.529.128.8179.628.728.9
2919.117.017.417.927.117.017.517.617.517.4
3019.865.928.6179.916.221.621.418.921.421.5
OCH3 55.4 51.4
OCH3 21.721.421.221.5
C=O 170.4171.1169.9171.5173.5 173.7
2′ 34.9 34.9
3′ 25.2 25.2
4′–13′ 29.2–29.7 29.2–29.5
14′ 29.7 31.9
15′ 29.5 22.7
16′ 31.9 14.1
17′ 22.7
18′ 14.1
Ref[189][185][232][233][232][234][235][236][6][190]
C U64 c U65 U66 a U67 U68 U69 a U71 U72 U73c U74
138.943.039.439.539.548.039.733.634.138.4
229.3175.534.834.234.268.634.125.825.726.8
3208.1207.7216.2217.9217.883.7217.374.276.377.4
447.250.747.447.547.539.947.737.442.638.4
555.647.755.255.355.355.955.248.154.154.8
619.820.419.819.719.718.918.617.119.018.2
734.032.132.532.332.433.532.432.933.232.3
840.240.040.340.240.140.144.544.641.339.6
946.640.447.146.946.947.060.761.248.147.2
1037.542.336.736.736.738.536.137.237.438.4
1124.523.823.823.723.723.8199.5199.373.123.0
12127.9125.1125.2125.5125.8125.5130.7130.3127.3124.8
13138.8139.1139.3138.0137.9139.3163.5163.3139.4138.0
1442.042.743.142.642.242.643.843.643.142.2
1528.726.526.526.325.928.728.528.327.725.5
1626.629.221.427.523.324.923.723.925.920.3
1748.435.239.738.037.948.147.747.048.936.4
1854.358.658.352.853.053.652.852.854.557.2
1973.238.434.834.034.139.438.638.171.933.6
2041.847.151.245.151.839.538.638.444.049.7
2127.071.834.432.425.131.030.330.127.233.1
2239.150.377.674.834.337.536.736.038.676.7
2323.523.926.726.726.729.426.628.8177.428.0
24181.119.5 *21.621.621.617.721.322.113.115.3
2515.019.4 *15.415.515.517.015.516.016.415.7
2617.016.916.916.816.817.519.018.717.716.4
2725.322.923.823.823.523.920.920.425.223.1
2865.428.425.221.769.3179.9180.0180.0179.724.3
2926.917.419.018.518.017.517.016.527.717.9
3016.815.8178.2182.1181.621.421.020.417.9177.0
Ref[232][54][129][61][61][157][185][185][232][237]
C U75 U76 U77 d U78 a U79 U80 U81 U82 U83 a U84
142.738.139.048.040.040.940.440.833.938.8
234.523.828.368.634.427.327.827.428.427.3
374.680.879.183.9NR78.580.678.778.879.0
445.437.539.239.847.939.043.039.038.938.8
549.955.155.556.155.654.855.854.955.455.4
619.318.018.619.019.018.518.418.518.118.4
766.932.733.333.632.437.033.936.733.232.9
840.939.338.940.743.944.142.744.640.339.4
948.947.347.847.960.954.454.455.748.647.8
1039.136.937.138.536.838.237.838.241.437.2
1124.623.423.624.2199.269.970.168.125.223.4
12126.7125.5125.8128.2130.5145.7144.7129.8125.7125.0
13139.7137.8138.5139.5165.5117.0115.8143.5138.9138.0
1443.341.642.342.145.146.540.947.742.342.8
1529.227.927.029.829.868.226.968.026.729.2
1625.323.924.526.827.438.727.638.828.222.6
1748.647.848.148.634.334.133.234.033.736.8
1854.452.353.154.559.247.347.758.359.054.1
1940.438.839.472.739.440.540.839.134.138.9
2040.438.739.742.239.439.339.539.247.339.4
2131.830.430.925.931.031.031.230.925.330.7
2238.136.537.237.541.041.141.540.941.230.6
2323.127.928.329.426.528.222.628.229.028.1
2465.916.917.117.621.615.664.415.616.115.4
2517.415.515.717.415.916.717.316.861.015.6
2621.616.515.916.718.518.617.918.617.416.9
2724.123.923.824.720.618.224.117.223.723.4
28181.6184.0181.1177.029.029.328.729.328.769.7
2917.616.817.327.017.616.816.717.517.116.2
3017.721.021.517.021.321.121.121.365.921.3
1′ 93.7
2′ 79.3
3′ 79.0
4′ 70.9
5′ 79.1
6′ 62.4
1″ 104.8
2″ 75.9
3″ 78.3
4″ 72.9
5″ 78.1
6″ 63.9
Ref[238][239][240][241][242][54][193][54][243][244]
C U85 U86 U88
138.837.736.8
227.427.125.2
379.079.178.2
438.838.738.4
555.355.450.7
618.418.817.9
734.641.831.6
841.038.940.2
950.549.2154.0
1037.237.938.2
1122.217.4114.9
1224.732.2122.5
13135.440.0140.7
1445.0159.242.6
1526.8116.327.8
1638.940.625.7
1734.033.933.2
18136.460.456.8
1936.735.438.5
2035.036.538.9
2123.728.530.7
2236.338.540.9
2328.128.028.2
2415.515.516.9
2516.315.217.1
2617.826.321.6
2721.919.424.9
2828.337.029.2
2923.127.517.1
3020.522.521.0
Ref[245][245][246]

Ref: References; * Values bearing the same superscript are interchangeable; NR: Not reported; Solvent CDCl3; a Pyridine-d5; b CD3OD; c CDCl3 + DMSO-d6; d CDCl3+CD3OD; 13C-NMR data of some compounds were not found. In these cases, the reported identification were performed by comparison of other physical data: U30, U53 [247], U70 (1H -NMR, IR, MS) [248] e U87 (m.p., [α]D, IR, 1H-NMR) [249].

Table 8

13C-NMR data of pentacyclic triterpenoids classified as others isolated from Celastraceae species (2001–2021).

COT3OT4OT5OT6OT7OT8OT9 aOT10 aOT11 aOT12
139.638.9104.618.237.837.2104.5106.2121.336.6
234.227.5144.727.827.1194.7147.5146.9182.034.8
3218.278.4144.276.379.0200.1144.2144.4182.2217.1
447.439.0118.040.838.7123.8118.1128.7131.447.6
554.955.3129.8141.655.5154.8129.8117.6142.153.2
619.718.5122.5122.018.875.0122.6121.6121.326.3
733.733.4127.923.541.3122.9127.9130.0153.222.6
841.641.7131.347.838.9154.0131.3141.747.641.0
949.650.4135.634.849.251.6135.3132.2144.8147.4
1036.837.2129.549.638.071.6129.5131.8158.239.3
1121.621.125.534.617.528.229.3129.0128.3115.6
1223.924.032.830.537.729.535.9138.138.936.1
1349.649.5102.537.736.038.254.544.141.636.7
1442.142.143.639.5158.040.3156.849.043.238.2
1532.633.738.832.5116.928.534.131.324.829.6
1621.621.740.235.733.635.641.438.838.635.8
1754.954.942.630.537.630.741.632.433.242.8
1844.744.846.041.948.043.450.443.248.252.0
1941.941.932.839.331.130.636.832.732.620.1
2027.327.440.233.133.841.741.941.941.728.2
2146.446.536.829.528.129.930.831.031.159.6
22148.6148.636.927.935.335.935.536.234.530.7
2326.628.211.628.928.09.511.611.611.222.0
2421.115.7 25.415.5 25.5
2515.716.720.516.115.427.020.719.527.721.6
2616.415.923.218.125.921.528.020.120.516.9
2716.616.723.220.421.128.7108.323.420.515.3
2816.116.125.132.029.931.731.331.731.813.9
29110.1110.2180.574.473.9178.8184.7183.6183.222.1
3025.025.026.326.024.632.525.932.534.023.0
Ref[94][94][139][213][213][250][139][139][139][251]
C OT13 OT14 OT15 OT17 OT18 OT19 OT20 OT21
1110.7110.698.938.518.223.636.138.1
2163.7163.7143.227.427.818.127.827.3
3 178.179.076.376.279.079.2
424.728.240.139.040.839.239.639.1
5103.7105.643.355.7141.7141.652.355.7
6126.4125.828.218.3122.0121.921.419.0
7115.9115.917.334.723.827.726.735.3
8161.1160.447.740.845.743.041.038.9
939.639.538.851.334.834.8148.948.9
10165.2166.147.837.349.746.639.137.9
1133.433.333.921.229.934.6114.317.7
1229.729.728.726.229.730.336.035.9
1340.540.338.939.038.437.736.837.9
1444.144.137.643.438.640.738.2158.1
1528.428.428.827.634.332.029.7117.0
1635.535.535.937.736.335.935.936.9
1738.238.230.134.432.930.043.038.1
1843.443.444.2142.844.747.452.149.4
1932.032.130.2129.835.835.120.241.4
2041.941.940.332.334.528.228.229.0
21213.8213.729.933.474.733.059.633.9
2252.552.536.237.446.338.930.833.2
23 7.928.025.428.928.228.1
24 99.415.428.925.415.615.6
2536.836.517.516.116.616.222.115.6
2622.522.515.916.717.018.417.030.1
2719.719.817.214.619.119.615.326.0
2832.532.631.625.333.132.414.030.1
29 179.031.332.334.623.033.5
3015.115.131.829.224.632.022.221.5
OCH350.551.051.3
Ref[252][252][196][220][196][157][253][254]

Ref: References; NR: Not reported; Solvent CDCl3; a CD3OD; 13C-NMR data of some compounds were not found. In these cases, the reported identification was performed by comparison of other physical data: OT1 (m.p., [α]D, IR, 1H-NMR) [255], OT2 e OT16 (m.p., [α]D, IR, 1H-NMR, MS) [256].

4. Conclusions

This review describes 504 pentacyclic triterpenoids isolated from Celastraceae species, classified as aromatics (29), dimers (50), friedelanes (103), lupanes (89), oleananes (102), quinonemethides (22), ursanes (88) and others (21). The data reported highlights the abundance and structural diversity of pentacyclic triterpenes isolated from plants of this family. The chemical complexity of these compounds helps to rationalize the various biological properties associated with these plant species, as well as these pure metabolites. The compilation of PCTTs 13C-NMR data presented in this review represents a contribution to the structural elucidation of new compounds of this class of terpenes.
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