Literature DB >> 31871751

Crystal and mol-ecular structure of jatrophane diterpenoid (2R,3R,4S,5R,7S,8S,9S,13S,14S,15R)-2,3,8,9-tetra-acet-oxy-5,14-bis-(benzo-yloxy)-15-hydroxy-7-(iso-butano-yloxy)jatropha-6(17),11(E)-diene.

Hequn Yang1, Jiangyu Zhao1, Samat Talipov2, Lidiya Izotova2, Haji Akber Aisa1, Bakhtiyar Ibragimov2.   

Abstract

The structure of the jatrophane diterpenoid (ES2), C46H56O15, has ortho-rhom-bic (P212121) symmetry. The absolute configuration in the crystal has been determined as 2R,3R,4S,5R,7S,8S,9S,13S,14S,15R [the Flack parameter is -0.06 (11)]. The mol-ecular structure features intra-molecular O-H⋯O and C-H⋯O hydrogen bonding. In the crystal, C-H⋯O hydrogen bonds link the mol-ecules into supra-molecular columns parallel to the a axis. One of the acet-oxy substituents is disordered over two orientations in a 0.826 (8):0.174 (8) ratio. © Yang et al. 2019.

Entities:  

Keywords:  crystal structure; hydrogen bonding; jatrophane diterpene

Year:  2019        PMID: 31871751      PMCID: PMC6895953          DOI: 10.1107/S205698901901541X

Source DB:  PubMed          Journal:  Acta Crystallogr E Crystallogr Commun


Chemical context

Macrocyclic diterpenes demonstrate a range of biological effects, including modulability of multidrug resistance, cytotoxicity, anti­proliferative, anti-inflammatory, and anti­microbial activities (Hohmann et al., 2002 ▸; Shi et al., 2008 ▸; Vasas & Hohmann, 2014 ▸). Jatrophane diterpenes, which possess fused five- and twelve-membered carbon rings are usually substituted by a variety of aryl and benzyl groups. The title compound ES2, a new type of jatrophane diterpenoid ester isolated from the fruits of Euphorbia sororia is widely used as a traditional Uyghur medicine in China (Lu et al., 2014 ▸) and shows promising chemo-reversal abilities compared to verapamil (Hu et al., 2018 ▸). ES2 has demonstrated cytotoxicity and anti-multidrug resistance activity in multidrug-resistant MCF-7/ADR breast cancer cells (Fang et al., 2018 ▸). The structure of this compound has been determined by X-ray structure analysis and reported in the present article.

Structural commentary

The ES2 mol­ecule consists of five-membered and twelve-membered rings (Fig. 1 ▸). The configuration at the ring junction C4—C15 is trans. The five-membered ring adopts an envelope conformation, with atoms C1, C2, C3 and C4 coplanar to within 0.008 Å and atom C15 displaced from this mean plane by 0.631 (7) Å. The C11=C12 double bond and the C4—C5 and C7—C8 bonds in the twelve-membered ring adopt a trans conformation, with C10—C11—C12—C13 and C15—C4—C5—C6 torsion angles of 172.8 (4) and 178.7 (4)°, respectively. There are six asymmetric carbon atoms in the twelve-membered ring and four in the five-membered ring. This Jatrophane diterpene is substituted by a variety of functional groups. The benzo­yloxy substituents are both situated on the same side of the twelve-membered ring, but their conformation is not planar. The angles between the planes of the phenyl rings and the corresponding ester fragments is 15.50 (2)° (C5/O5/C25/O4/C26) and 10.00 (2)° (C14/O2/C40/O1/C41). Of the four acetyl substituents, two (at C3 and C8), as well as the hydroxyl at C15, are located on the same side as the benzoyl rings in relation to the twelve-membered ring.
Figure 1

The mol­ecular structure of the title compound ES2 with atom labelling. Displacement ellipsoids are drawn at the 50% probability level.

Six intra­molecular hydrogen bonds, one conventional O—H⋯O and five weak C—H⋯O (Table 1 ▸), help to stabilize the mol­ecular structure. The O3—H3A⋯O5 hydrogen bond is formed between the 15-hy­droxy group as donor and the ether oxygen of the adjacent benzo­yloxy substituent.
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯A D—HH⋯A DA D—H⋯A
O3—H3A⋯O50.822.112.821 (4)145
C1—H1A⋯O15B 0.972.252.78 (2)113
C3—H3B⋯O110.982.473.330 (6)147
C4—H4A⋯O15B 0.982.543.12 (2)118
C16—H16A⋯O30.962.623.222 (6)121
C16—H16C⋯O15A 0.962.392.946 (7)116
C37—H37B⋯O9i 0.962.393.239 (8)147
C37—H37C⋯O15B ii 0.962.192.92 (2)132

Symmetry codes: (i) ; (ii) .

Supra­molecular features

In the crystal, two C—H⋯O hydrogen bonds form between the methyl group (C37) of the 8-acet­oxy group as donor and the carbonyl O atoms of the acet­oxy substituents in positions 2 (O15B) and 9 (O9) as acceptors (Table 1 ▸). These inter­actions link mol­ecules related by symmetry operation 21 and translation parallel to the a axis, respectively. Together they form extended supra­mol­ecular columns parallel to the a axis (Fig. 2 ▸). Only van der Waals inter­actions occur between the columns. The OH group is not involved in inter­molecular hydrogen-bonding inter­actions, only intra­molecular.
Figure 2

Crystal structure of the title compound ES2 viewed along the b axis. Inter­molecular hydrogen bonds (Table 1 ▸) are shown as dashed lines. Hydrogen atoms have been omitted for clarity. [Symmetry codes: (i) x + , −y + , −z + 1; (ii) x + 1, y, z.]

Database survey

The Cambridge Structural Database (CSD version 5.40, last update November 2018; Groom et al., 2016 ▸) includes crystallographic data for 19 jatrophane diterpenes. The first example of a similar compound in the literature, esulone A [(E)-(−)-(2R,3R,4S,5R,7S,8R,13S,15R)-diacet­oxy-5,7-dibenzo­yloxy-2,8-hy­droxy-jatropha-6(17),11-diene-9,14-dione (DEDMUU; Manners & Wong, 1985 ▸), was isolated from Euphorbia esula roots. Eight jatrophane esters were investigated by No­thias-Scaglia et al. (2014 ▸): JAQWUW, JAQXAD, YOLPOG, YOLPUM and YOLQAT, JAQXEH, JAQXIL and YOLQEX. Similar compounds studied are EZIHUS, EZIJAA and EZIJEE(Esposito et al., 2016 ▸), PEMQON (Kar et al., 1998 ▸), SUXHUO (Liu & Tan, 2001 ▸), and altotibetin A and altotibetin B (OKICIU and OKICOA; Li et al., 2003 ▸). In ZUKLIA and ZUKLOG (terracinolide A and terracinolide B; Marco et al., 1996 ▸) and ZELWEV01 (Hu et al., 2018 ▸), a lactone ring substituent is present, so the configuration at the C5—C6 ring junction is cis. The structure of EZIJAA, (2R,3R,4S,5R,7R,8R,9R,13S,15R)-2,9-diacet­oxy-3,8,15-trihy­droxy-5,7-dibenzo­yloxy-14-oxo­jatropha- 6(17),11(E)-diene diethyl ether solvate (Esposito et al., 2016 ▸) is the most similar to that of the title compound. Both structures have trans-conjugated five- and twelve-membered rings, but the envelope conformation of the former in EZIJAA is different. Atom C4 (not C15 as in title structure) is out of the mean plane. In both structures, the substituent at C5 is a Bz-group, but in EZIJAA the benzyl ring is less inclined to the mean plane of atoms C5/O5/C25/O4/C26 [5.67 (4)° compared to 15.50 (2)° in the title compound]. In both structures, a strong intra­molecular hydrogen bond is observed between Bz-group at C5 and the hydroxyl group at C15. However, the presence of three hydroxyl substitutes at C3, C8 and C15 leads to the appearance of four intra­molecular hydrogen bonds in the structure of EZIJAA, which is more loosely packed than that of the title compound and which contains voids.

Synthesis and crystallization

The process of extraction and isolation of ES2 is described in detail by Lu et al. (2014 ▸). Colourless prismatic single crystals were prepared by slow evaporation of the solvent from an ethanol solution at room temperature. The absolute configuration was been determined as 2R,3R,4S,5R,7S,8S,9S,13S,14S,15R, the same as reported by Lu et al. (2014 ▸).

Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2 ▸. All hydrogen atoms were placed in idealized positions (O—H = 0.82, C—H = 0.93–0.98 Å) and refined as riding atoms. For the hydroxyl group, possible hydrogen-bonding positions were taken into account in generating the idealized position (AFIX 83). U iso(H) values were set to a multiple of U eq(C,O) with multipliers of 1.5 for CH3 and OH, and 1.2 for CH and CH2 units, respectively.
Table 2

Experimental details

Crystal data
Chemical formulaC46H56O15
M r 848.90
Crystal system, space groupOrthorhombic, P212121
Temperature (K)104
a, b, c (Å)8.9730 (5), 20.9171 (9), 23.9201 (11)
V3)4489.5 (4)
Z 4
Radiation typeCu Kα
μ (mm−1)0.78
Crystal size (mm)0.3 × 0.2 × 0.1
 
Data collection
DiffractometerAgilent Xcalibur Ruby
Absorption correctionMulti-scan (CrysAlis PRO; Agilent, 2014)
T min, T max 0.748, 1.000
No. of measured, independent and observed [I > 2σ(I)] reflections37870, 9301, 7007
R int 0.058
(sin θ/λ)max−1)0.631
 
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S 0.056, 0.153, 1.02
No. of reflections9301
No. of parameters587
No. of restraints1
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å−3)0.26, −0.19
Absolute structureFlack x determined using 2403 quotients [(I +)−(I )]/[(I +)+(I )] (Parsons et al., 2013)
Absolute structure parameter−0.06 (11)

Computer programs: CrysAlis PRO (Agilent, 2014 ▸), SHELXS97 (Sheldrick, 2008 ▸), SHELXL2018 (Sheldrick, 2015 ▸) and XP (Siemens, 1994 ▸).

A large difference peak and Hirshfeld test deviations indicated disorder of the C2-acet­oxy group. The disordered atoms were modelled over two positions using the PART instruction with occupancies for the dominant and minor positions of 83% and 17%, respectively. A bond distance restraint to a target value of 1.4 (1) Å was used in the disordered acetyl group (C21B–C22B). Crystal structure: contains datablock(s) I. DOI: 10.1107/S205698901901541X/fy2141sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S205698901901541X/fy2141Isup3.hkl CCDC reference: 1965699 Additional supporting information: crystallographic information; 3D view; checkCIF report
C46H56O15Dx = 1.256 Mg m3Dm = 1.256 Mg m3Dm measured by not measured
Mr = 848.90Melting point: 166 K
Orthorhombic, P212121Cu Kα radiation, λ = 1.54184 Å
a = 8.9730 (5) ÅCell parameters from 5355 reflections
b = 20.9171 (9) Åθ = 4.2–69.6°
c = 23.9201 (11) ŵ = 0.78 mm1
V = 4489.5 (4) Å3T = 104 K
Z = 4Prism, colourless
F(000) = 18080.3 × 0.2 × 0.1 mm
Agilent Xcalibur Ruby diffractometer9301 independent reflections
Radiation source: fine-focus sealed tube7007 reflections with I > 2σ(I)
Detector resolution: 10.2576 pixels mm-1Rint = 0.058
ω scansθmax = 76.5°, θmin = 3.7°
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2014)h = −11→10
Tmin = 0.748, Tmax = 1.000k = −26→26
37870 measured reflectionsl = −30→27
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.056H-atom parameters constrained
wR(F2) = 0.153w = 1/[σ2(Fo2) + (0.071P)2 + 1.4583P] where P = (Fo2 + 2Fc2)/3
S = 1.02(Δ/σ)max = 0.010
9301 reflectionsΔρmax = 0.26 e Å3
587 parametersΔρmin = −0.19 e Å3
1 restraintAbsolute structure: Flack x determined using 2403 quotients [(I+)-(I-)]/[(I+)+(I-)] (Parsons et al., 2013)
Primary atom site location: structure-invariant direct methodsAbsolute structure parameter: −0.06 (11)
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > 2sigma(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.
xyzUiso*/UeqOcc. (<1)
O10.0006 (4)0.69300 (16)0.89766 (13)0.0618 (9)
O20.1295 (3)0.67482 (14)0.81877 (12)0.0470 (7)
O30.0829 (3)0.54758 (14)0.83474 (12)0.0480 (7)
H3A0.1739630.5441450.8344840.072*
O40.5306 (4)0.64154 (17)0.78021 (13)0.0559 (8)
O50.3694 (3)0.55943 (14)0.78729 (12)0.0444 (6)
O60.5606 (3)0.62727 (17)0.58845 (13)0.0546 (8)
O70.7062 (4)0.6966 (2)0.63330 (16)0.0720 (11)
O80.2610 (4)0.67436 (14)0.54698 (12)0.0483 (7)
O90.3759 (5)0.7351 (2)0.48129 (16)0.0840 (13)
O100.3579 (4)0.54361 (15)0.58592 (12)0.0503 (7)
O110.1132 (4)0.52049 (15)0.58730 (15)0.0577 (8)
O120.2136 (3)0.44549 (13)0.75343 (12)0.0473 (7)
O130.2862 (5)0.3971 (2)0.67361 (18)0.0914 (15)
C1−0.1069 (5)0.5379 (2)0.7667 (2)0.0487 (11)
H1A−0.1625960.5612250.7385810.058*
H1B−0.1701180.5316200.7991440.058*
C2−0.0527 (5)0.47277 (19)0.7433 (2)0.0487 (11)
C30.1086 (5)0.4847 (2)0.72294 (18)0.0440 (9)
H3B0.1160830.4758130.6828110.053*
C40.1368 (5)0.55634 (19)0.73401 (17)0.0411 (9)
H4A0.0935090.5781170.7015640.049*
C50.2995 (5)0.5796 (2)0.73579 (17)0.0426 (9)
H5A0.2984120.6264640.7352780.051*
C60.3880 (5)0.5570 (2)0.68555 (18)0.0480 (10)
C70.3389 (5)0.5878 (2)0.63125 (17)0.0439 (10)
H7A0.2335270.5997770.6340480.053*
C80.4323 (5)0.6479 (2)0.62011 (18)0.0479 (10)
H8A0.4676270.6641570.6561850.057*
C90.3534 (5)0.7022 (2)0.59007 (18)0.0479 (10)
H9A0.4295420.7284410.5716980.058*
C100.2576 (5)0.7471 (2)0.62756 (18)0.0479 (10)
C110.1315 (5)0.7128 (2)0.65684 (18)0.0463 (10)
H11A0.0692910.6879820.6345870.056*
C120.1009 (5)0.7145 (2)0.71069 (18)0.0444 (10)
H12A0.1693860.7351700.7335860.053*
C13−0.0346 (5)0.68617 (19)0.73900 (19)0.0450 (10)
H13A−0.0858970.6586350.7120040.054*
C140.0022 (5)0.64604 (19)0.79088 (18)0.0447 (10)
H14A−0.0828490.6495300.8164010.054*
C150.0340 (5)0.5742 (2)0.78276 (18)0.0432 (9)
C16−0.0717 (6)0.4202 (2)0.7860 (2)0.0641 (14)
H16A−0.0181930.4311460.8194200.096*
H16B−0.1755630.4152220.7945930.096*
H16C−0.0334120.3808740.7711490.096*
C170.5020 (6)0.5180 (3)0.6878 (2)0.0649 (14)
H17A0.5552650.5085270.6555170.097*
H17B0.5296530.4997900.7217300.097*
C180.3639 (6)0.7802 (2)0.6688 (2)0.0549 (12)
H18A0.4418730.8012910.6484620.082*
H18B0.3095310.8111490.6903700.082*
H18C0.4065480.7489180.6934310.082*
C190.1882 (6)0.7986 (2)0.5893 (2)0.0585 (12)
H19A0.2660060.8212310.5701410.088*
H19B0.1237810.7785910.5624930.088*
H19C0.1316160.8281330.6115820.088*
C20−0.1399 (6)0.7408 (2)0.7548 (2)0.0549 (11)
H20A−0.2267400.7237140.7728880.082*
H20B−0.0898490.7695990.7798420.082*
H20C−0.1692210.7634880.7217020.082*
C230.2943 (6)0.4030 (3)0.7229 (2)0.0626 (14)
C240.4005 (6)0.3686 (3)0.7603 (3)0.0712 (16)
H24A0.3846130.3818440.7983040.107*
H24B0.3843380.3233850.7572920.107*
H24C0.5009280.3784850.7494890.107*
C250.4866 (5)0.5943 (2)0.80471 (18)0.0457 (10)
C260.5574 (5)0.5679 (2)0.85550 (18)0.0469 (10)
C270.5303 (6)0.5046 (2)0.8724 (2)0.0548 (12)
H27A0.4606430.4795620.8536380.066*
C280.6074 (7)0.4804 (3)0.9166 (2)0.0652 (14)
H28A0.5896480.4386480.9281970.078*
C290.7118 (7)0.5171 (3)0.9445 (2)0.0659 (14)
H29A0.7650910.4994560.9740150.079*
C300.7379 (6)0.5799 (3)0.9288 (2)0.0580 (12)
H30A0.8056320.6050310.9483480.070*
C310.6621 (5)0.6040 (2)0.88420 (19)0.0503 (11)
H31A0.6810260.6457160.8726970.060*
C320.2368 (6)0.5102 (2)0.5696 (2)0.0524 (11)
C330.2844 (8)0.4574 (3)0.5295 (3)0.0758 (17)
H33A0.3648410.4337600.5480030.091*
C340.1575 (8)0.4108 (3)0.5216 (3)0.097 (2)
H34A0.1234330.3961310.5573730.145*
H34B0.0771230.4316840.5023550.145*
H34C0.1912450.3750060.4998670.145*
C350.3466 (11)0.4834 (4)0.4777 (3)0.125 (3)
H35A0.4261770.5123760.4865410.187*
H35B0.3842810.4491030.4551270.187*
H35C0.2701590.5057800.4576160.187*
C360.6929 (5)0.6534 (3)0.60053 (19)0.0543 (12)
C370.8145 (6)0.6231 (3)0.5679 (2)0.0679 (14)
H37A0.7740400.5897460.5449230.102*
H37B0.8614010.6546510.5446940.102*
H37C0.8868410.6053000.5930870.102*
C380.2832 (6)0.6946 (3)0.4941 (2)0.0600 (13)
C390.1787 (8)0.6624 (3)0.4550 (2)0.0738 (17)
H39A0.1176370.6328000.4753380.111*
H39B0.1164670.6938730.4373530.111*
H39C0.2344050.6398670.4269810.111*
C400.1127 (6)0.69846 (19)0.87095 (17)0.0471 (10)
C410.2520 (6)0.73057 (18)0.89048 (17)0.0463 (11)
C420.3702 (6)0.7442 (2)0.85517 (19)0.0537 (12)
H42A0.3649420.7331400.8175720.064*
C430.4957 (6)0.7742 (2)0.8757 (2)0.0589 (13)
H43A0.5745250.7836030.8518440.071*
C440.5043 (7)0.7901 (2)0.9311 (2)0.0615 (14)
H44A0.5894710.8101250.9446700.074*
C450.3878 (7)0.7768 (2)0.9670 (2)0.0650 (15)
H45A0.3947300.7872871.0046680.078*
C460.2621 (7)0.7480 (2)0.94659 (19)0.0556 (12)
H46A0.1824580.7400160.9704640.067*
O14A−0.1487 (7)0.4643 (3)0.6922 (3)0.0503 (15)0.826 (8)
O15A−0.0385 (5)0.37019 (18)0.6716 (2)0.0693 (15)0.826 (8)
C21A−0.1251 (7)0.4117 (3)0.6604 (3)0.0609 (18)0.826 (8)
C22A−0.2263 (13)0.4133 (4)0.6105 (5)0.077 (3)0.826 (8)
H22A−0.2846040.4518030.6113330.116*0.826 (8)
H22B−0.1677590.4123140.5769580.116*0.826 (8)
H22C−0.2914180.3769130.6113830.116*0.826 (8)
O15B−0.122 (2)0.5249 (12)0.6513 (8)0.062 (6)0.174 (8)
O14B−0.139 (3)0.4383 (12)0.7081 (13)0.050 (7)0.174 (8)
C21B−0.160 (3)0.4701 (18)0.6577 (16)0.054 (8)0.174 (8)
C22B−0.207 (5)0.434 (3)0.611 (2)0.10 (2)0.174 (8)
H22D−0.2327760.3915060.6234050.151*0.174 (8)
H22E−0.2929280.4538410.5948590.151*0.174 (8)
H22F−0.1284280.4316720.5842980.151*0.174 (8)
U11U22U33U12U13U23
O10.071 (2)0.061 (2)0.0533 (19)−0.0157 (18)0.0232 (18)−0.0141 (15)
O20.0501 (17)0.0486 (15)0.0422 (15)−0.0141 (14)0.0098 (14)−0.0116 (13)
O30.0454 (17)0.0487 (16)0.0499 (17)−0.0067 (13)0.0091 (14)−0.0044 (13)
O40.0495 (19)0.071 (2)0.0467 (17)−0.0214 (17)0.0017 (15)0.0036 (15)
O50.0385 (15)0.0516 (16)0.0431 (15)−0.0053 (13)−0.0045 (13)−0.0031 (13)
O60.0378 (16)0.080 (2)0.0455 (17)−0.0068 (16)0.0021 (14)−0.0171 (16)
O70.053 (2)0.096 (3)0.067 (2)−0.021 (2)0.0049 (18)−0.023 (2)
O80.0508 (18)0.0529 (16)0.0410 (15)−0.0042 (14)−0.0002 (14)−0.0088 (13)
O90.078 (3)0.118 (3)0.056 (2)−0.026 (3)0.012 (2)0.000 (2)
O100.0503 (18)0.0554 (17)0.0452 (16)−0.0009 (15)0.0044 (15)−0.0169 (13)
O110.051 (2)0.0502 (18)0.072 (2)−0.0022 (15)−0.0154 (17)−0.0163 (16)
O120.0456 (17)0.0435 (15)0.0529 (17)0.0066 (13)−0.0095 (14)−0.0092 (13)
O130.092 (3)0.107 (3)0.075 (3)0.062 (3)−0.033 (2)−0.044 (2)
C10.043 (2)0.039 (2)0.064 (3)−0.0049 (18)0.005 (2)−0.0133 (19)
C20.041 (2)0.036 (2)0.069 (3)−0.0022 (17)−0.005 (2)−0.014 (2)
C30.039 (2)0.044 (2)0.049 (2)0.0061 (18)−0.0042 (19)−0.0043 (18)
C40.039 (2)0.041 (2)0.044 (2)−0.0029 (18)0.0007 (18)−0.0091 (17)
C50.037 (2)0.051 (2)0.040 (2)−0.0010 (18)0.0013 (17)−0.0046 (17)
C60.034 (2)0.061 (3)0.049 (2)0.001 (2)−0.0008 (19)−0.007 (2)
C70.039 (2)0.053 (2)0.040 (2)−0.0027 (19)0.0045 (18)−0.0150 (18)
C80.042 (2)0.062 (3)0.039 (2)−0.008 (2)0.0038 (19)−0.017 (2)
C90.044 (2)0.057 (2)0.042 (2)−0.013 (2)0.0043 (19)−0.0109 (19)
C100.049 (3)0.049 (2)0.046 (2)−0.008 (2)0.006 (2)−0.0117 (19)
C110.044 (2)0.043 (2)0.052 (2)−0.0085 (19)0.001 (2)−0.0147 (18)
C120.042 (2)0.044 (2)0.048 (2)−0.0032 (18)0.001 (2)−0.0103 (18)
C130.039 (2)0.041 (2)0.055 (2)−0.0051 (18)0.0085 (19)−0.0129 (18)
C140.041 (2)0.045 (2)0.048 (2)−0.0096 (18)0.012 (2)−0.0153 (18)
C150.039 (2)0.045 (2)0.046 (2)−0.0057 (18)0.0046 (18)−0.0057 (18)
C160.059 (3)0.044 (2)0.089 (4)−0.004 (2)0.013 (3)−0.002 (2)
C170.048 (3)0.088 (4)0.059 (3)0.013 (3)0.009 (2)−0.007 (3)
C180.052 (3)0.057 (3)0.056 (3)−0.020 (2)0.009 (2)−0.018 (2)
C190.063 (3)0.052 (2)0.060 (3)−0.008 (2)0.012 (2)−0.010 (2)
C200.050 (3)0.050 (2)0.065 (3)−0.002 (2)0.013 (2)−0.010 (2)
C230.052 (3)0.068 (3)0.068 (3)0.016 (2)−0.022 (2)−0.019 (3)
C240.060 (3)0.064 (3)0.090 (4)0.021 (3)−0.030 (3)−0.015 (3)
C250.034 (2)0.063 (3)0.040 (2)−0.008 (2)0.0044 (17)−0.0092 (19)
C260.038 (2)0.055 (3)0.047 (2)−0.0015 (19)0.0010 (19)−0.0046 (19)
C270.049 (3)0.064 (3)0.052 (3)−0.008 (2)−0.003 (2)−0.008 (2)
C280.067 (4)0.058 (3)0.071 (3)−0.004 (3)−0.012 (3)0.003 (2)
C290.060 (3)0.080 (3)0.057 (3)−0.003 (3)−0.015 (3)0.005 (3)
C300.050 (3)0.072 (3)0.052 (3)−0.013 (3)−0.008 (2)−0.003 (2)
C310.045 (3)0.060 (3)0.045 (2)−0.010 (2)0.005 (2)−0.005 (2)
C320.056 (3)0.049 (2)0.052 (3)0.005 (2)−0.008 (2)−0.013 (2)
C330.093 (5)0.061 (3)0.073 (4)0.012 (3)−0.016 (3)−0.028 (3)
C340.101 (5)0.067 (4)0.122 (6)0.008 (4)−0.030 (5)−0.046 (4)
C350.142 (8)0.132 (7)0.100 (6)0.007 (6)0.024 (6)−0.069 (5)
C360.042 (3)0.077 (3)0.044 (2)−0.009 (2)−0.004 (2)−0.003 (2)
C370.045 (3)0.090 (4)0.069 (3)−0.011 (3)0.007 (3)−0.009 (3)
C380.059 (3)0.075 (3)0.045 (3)0.005 (3)0.003 (2)−0.010 (2)
C390.092 (5)0.074 (3)0.056 (3)0.010 (3)−0.025 (3)−0.010 (3)
C400.067 (3)0.038 (2)0.037 (2)−0.008 (2)0.009 (2)−0.0032 (16)
C410.071 (3)0.0301 (18)0.038 (2)−0.006 (2)−0.005 (2)0.0001 (16)
C420.069 (3)0.051 (2)0.041 (2)−0.015 (2)−0.004 (2)−0.0003 (19)
C430.070 (3)0.054 (3)0.053 (3)−0.020 (2)−0.015 (3)0.007 (2)
C440.079 (4)0.039 (2)0.066 (3)−0.014 (2)−0.029 (3)0.005 (2)
C450.099 (5)0.053 (3)0.043 (3)−0.001 (3)−0.023 (3)−0.007 (2)
C460.080 (4)0.043 (2)0.043 (2)−0.002 (2)−0.001 (2)−0.0023 (19)
O14A0.043 (3)0.031 (3)0.077 (5)0.004 (2)−0.021 (3)−0.013 (3)
O15A0.077 (3)0.039 (2)0.092 (3)0.019 (2)−0.028 (3)−0.021 (2)
C21A0.055 (4)0.037 (3)0.091 (5)0.000 (3)−0.021 (4)−0.018 (3)
C22A0.085 (7)0.040 (4)0.107 (6)0.001 (4)−0.052 (5)−0.025 (4)
O15B0.047 (11)0.087 (17)0.053 (12)0.007 (11)−0.011 (9)0.003 (10)
O14B0.036 (11)0.044 (15)0.070 (19)0.005 (12)0.003 (11)−0.019 (12)
C21B0.032 (14)0.07 (2)0.06 (2)0.005 (13)−0.025 (15)0.003 (18)
C22B0.040 (19)0.09 (4)0.17 (5)−0.03 (2)0.03 (3)−0.10 (4)
O1—C401.197 (5)C19—H19B0.9600
O2—C401.351 (5)C19—H19C0.9600
O2—C141.454 (5)C20—H20A0.9600
O3—C151.432 (5)C20—H20B0.9600
O3—H3A0.8200C20—H20C0.9600
O4—C251.214 (5)C23—C241.492 (7)
O5—C251.347 (5)C24—H24A0.9600
O5—C51.445 (5)C24—H24B0.9600
O6—C361.339 (6)C24—H24C0.9600
O6—C81.444 (5)C25—C261.478 (6)
O7—C361.203 (6)C26—C311.388 (6)
O8—C381.349 (6)C26—C271.406 (7)
O8—C91.446 (5)C27—C281.361 (7)
O9—C381.225 (7)C27—H27A0.9300
O10—C321.350 (6)C28—C291.382 (8)
O10—C71.435 (5)C28—H28A0.9300
O11—C321.206 (6)C29—C301.386 (8)
O12—C231.359 (6)C29—H29A0.9300
O12—C31.447 (5)C30—C311.362 (7)
O13—C231.188 (7)C30—H30A0.9300
C1—C151.523 (6)C31—H31A0.9300
C1—C21.552 (6)C32—C331.525 (7)
C1—H1A0.9700C33—C351.464 (10)
C1—H1B0.9700C33—C341.510 (9)
C2—O14B1.35 (3)C33—H33A0.9800
C2—O14A1.505 (8)C34—H34A0.9600
C2—C161.510 (7)C34—H34B0.9600
C2—C31.548 (6)C34—H34C0.9600
C3—C41.542 (6)C35—H35A0.9600
C3—H3B0.9800C35—H35B0.9600
C4—C151.533 (6)C35—H35C0.9600
C4—C51.539 (6)C36—C371.483 (7)
C4—H4A0.9800C37—H37A0.9600
C5—C61.516 (6)C37—H37B0.9600
C5—H5A0.9800C37—H37C0.9600
C6—C171.309 (7)C38—C391.486 (8)
C6—C71.516 (6)C39—H39A0.9600
C7—C81.534 (6)C39—H39B0.9600
C7—H7A0.9800C39—H39C0.9600
C8—C91.519 (7)C40—C411.494 (7)
C8—H8A0.9800C41—C421.386 (7)
C9—C101.557 (6)C41—C461.394 (6)
C9—H9A0.9800C42—C431.379 (7)
C10—C111.511 (6)C42—H42A0.9300
C10—C181.538 (6)C43—C441.368 (7)
C10—C191.545 (7)C43—H43A0.9300
C11—C121.318 (6)C44—C451.382 (8)
C11—H11A0.9300C44—H44A0.9300
C12—C131.513 (6)C45—C461.368 (8)
C12—H12A0.9300C45—H45A0.9300
C13—C201.531 (6)C46—H46A0.9300
C13—C141.534 (6)O14A—C21A1.355 (9)
C13—H13A0.9800O15A—C21A1.195 (7)
C14—C151.541 (6)C21A—C22A1.499 (11)
C14—H14A0.9800C22A—H22A0.9600
C16—H16A0.9600C22A—H22B0.9600
C16—H16B0.9600C22A—H22C0.9600
C16—H16C0.9600O15B—C21B1.20 (4)
C17—H17A0.9300O14B—C21B1.39 (5)
C17—H17B0.9300C21B—C22B1.407 (14)
C18—H18A0.9600C22B—H22D0.9600
C18—H18B0.9600C22B—H22E0.9600
C18—H18C0.9600C22B—H22F0.9600
C19—H19A0.9600
C40—O2—C14119.2 (3)H20A—C20—H20B109.5
C15—O3—H3A109.5C13—C20—H20C109.5
C25—O5—C5116.4 (3)H20A—C20—H20C109.5
C36—O6—C8118.2 (3)H20B—C20—H20C109.5
C38—O8—C9117.2 (4)O13—C23—O12124.7 (5)
C32—O10—C7117.1 (3)O13—C23—C24125.7 (5)
C23—O12—C3116.6 (3)O12—C23—C24109.5 (4)
C15—C1—C2105.6 (4)C23—C24—H24A109.5
C15—C1—H1A110.6C23—C24—H24B109.5
C2—C1—H1A110.6H24A—C24—H24B109.5
C15—C1—H1B110.6C23—C24—H24C109.5
C2—C1—H1B110.6H24A—C24—H24C109.5
H1A—C1—H1B108.7H24B—C24—H24C109.5
O14B—C2—C1688.2 (13)O4—C25—O5123.1 (4)
O14A—C2—C16113.5 (4)O4—C25—C26124.1 (4)
O14B—C2—C3115.2 (12)O5—C25—C26112.8 (4)
O14A—C2—C3107.4 (4)C31—C26—C27119.2 (4)
C16—C2—C3115.8 (4)C31—C26—C25119.6 (4)
O14B—C2—C1120.9 (11)C27—C26—C25121.0 (4)
O14A—C2—C1102.6 (4)C28—C27—C26119.0 (5)
C16—C2—C1111.1 (4)C28—C27—H27A120.5
C3—C2—C1105.3 (3)C26—C27—H27A120.5
O12—C3—C4111.0 (3)C27—C28—C29120.9 (5)
O12—C3—C2111.0 (4)C27—C28—H28A119.6
C4—C3—C2104.8 (3)C29—C28—H28A119.6
O12—C3—H3B110.0C28—C29—C30120.7 (5)
C4—C3—H3B110.0C28—C29—H29A119.6
C2—C3—H3B110.0C30—C29—H29A119.7
C15—C4—C5118.2 (3)C31—C30—C29118.6 (5)
C15—C4—C3105.6 (3)C31—C30—H30A120.7
C5—C4—C3117.9 (4)C29—C30—H30A120.7
C15—C4—H4A104.5C30—C31—C26121.6 (5)
C5—C4—H4A104.5C30—C31—H31A119.2
C3—C4—H4A104.5C26—C31—H31A119.2
O5—C5—C6110.9 (3)O11—C32—O10123.2 (4)
O5—C5—C4110.0 (3)O11—C32—C33127.4 (5)
C6—C5—C4112.1 (3)O10—C32—C33109.4 (5)
O5—C5—H5A107.9C35—C33—C34114.9 (6)
C6—C5—H5A107.9C35—C33—C32111.7 (5)
C4—C5—H5A107.9C34—C33—C32109.6 (6)
C17—C6—C7121.9 (4)C35—C33—H33A106.7
C17—C6—C5124.8 (5)C34—C33—H33A106.7
C7—C6—C5113.2 (4)C32—C33—H33A106.7
O10—C7—C6109.8 (4)C33—C34—H34A109.5
O10—C7—C8109.4 (3)C33—C34—H34B109.5
C6—C7—C8109.8 (4)H34A—C34—H34B109.5
O10—C7—H7A109.3C33—C34—H34C109.5
C6—C7—H7A109.3H34A—C34—H34C109.5
C8—C7—H7A109.3H34B—C34—H34C109.5
O6—C8—C9110.3 (4)C33—C35—H35A109.5
O6—C8—C7106.4 (3)C33—C35—H35B109.5
C9—C8—C7116.1 (4)H35A—C35—H35B109.5
O6—C8—H8A107.9C33—C35—H35C109.5
C9—C8—H8A107.9H35A—C35—H35C109.5
C7—C8—H8A107.9H35B—C35—H35C109.5
O8—C9—C8107.7 (3)O7—C36—O6122.4 (5)
O8—C9—C10109.7 (4)O7—C36—C37126.2 (5)
C8—C9—C10115.8 (4)O6—C36—C37111.4 (4)
O8—C9—H9A107.8C36—C37—H37A109.5
C8—C9—H9A107.8C36—C37—H37B109.5
C10—C9—H9A107.8H37A—C37—H37B109.5
C11—C10—C18112.4 (4)C36—C37—H37C109.5
C11—C10—C19107.7 (4)H37A—C37—H37C109.5
C18—C10—C19108.4 (4)H37B—C37—H37C109.5
C11—C10—C9113.2 (4)O9—C38—O8123.5 (5)
C18—C10—C9107.4 (4)O9—C38—C39125.7 (5)
C19—C10—C9107.6 (4)O8—C38—C39110.8 (5)
C12—C11—C10126.6 (4)C38—C39—H39A109.5
C12—C11—H11A116.7C38—C39—H39B109.5
C10—C11—H11A116.7H39A—C39—H39B109.5
C11—C12—C13126.5 (4)C38—C39—H39C109.5
C11—C12—H12A116.7H39A—C39—H39C109.5
C13—C12—H12A116.7H39B—C39—H39C109.5
C12—C13—C20108.3 (3)O1—C40—O2123.5 (4)
C12—C13—C14113.8 (4)O1—C40—C41125.4 (4)
C20—C13—C14110.0 (4)O2—C40—C41111.1 (4)
C12—C13—H13A108.2C42—C41—C46118.9 (5)
C20—C13—H13A108.2C42—C41—C40122.9 (4)
C14—C13—H13A108.2C46—C41—C40118.2 (4)
O2—C14—C13108.3 (3)C43—C42—C41120.1 (4)
O2—C14—C15108.4 (4)C43—C42—H42A119.9
C13—C14—C15118.1 (3)C41—C42—H42A119.9
O2—C14—H14A107.2C44—C43—C42120.1 (5)
C13—C14—H14A107.2C44—C43—H43A119.9
C15—C14—H14A107.2C42—C43—H43A119.9
O3—C15—C1106.2 (3)C43—C44—C45120.7 (5)
O3—C15—C4112.4 (4)C43—C44—H44A119.7
C1—C15—C4100.7 (3)C45—C44—H44A119.7
O3—C15—C14109.1 (3)C46—C45—C44119.4 (4)
C1—C15—C14111.3 (4)C46—C45—H45A120.3
C4—C15—C14116.4 (3)C44—C45—H45A120.3
C2—C16—H16A109.5C45—C46—C41120.8 (5)
C2—C16—H16B109.5C45—C46—H46A119.6
H16A—C16—H16B109.5C41—C46—H46A119.6
C2—C16—H16C109.5C21A—O14A—C2117.6 (5)
H16A—C16—H16C109.5O15A—C21A—O14A124.4 (6)
H16B—C16—H16C109.5O15A—C21A—C22A126.0 (6)
C6—C17—H17A120.0O14A—C21A—C22A109.5 (6)
C6—C17—H17B120.0C21A—C22A—H22A109.5
H17A—C17—H17B120.0C21A—C22A—H22B109.5
C10—C18—H18A109.5H22A—C22A—H22B109.5
C10—C18—H18B109.5C21A—C22A—H22C109.5
H18A—C18—H18B109.5H22A—C22A—H22C109.5
C10—C18—H18C109.5H22B—C22A—H22C109.5
H18A—C18—H18C109.5C2—O14B—C21B111 (2)
H18B—C18—H18C109.5O15B—C21B—O14B122 (3)
C10—C19—H19A109.5O15B—C21B—C22B120 (4)
C10—C19—H19B109.5O14B—C21B—C22B118 (4)
H19A—C19—H19B109.5C21B—C22B—H22D109.5
C10—C19—H19C109.5C21B—C22B—H22E109.5
H19A—C19—H19C109.5H22D—C22B—H22E109.5
H19B—C19—H19C109.5C21B—C22B—H22F109.5
C13—C20—H20A109.5H22D—C22B—H22F109.5
C13—C20—H20B109.5H22E—C22B—H22F109.5
C15—C1—C2—O14B−156.8 (15)C2—C1—C15—C439.8 (5)
C15—C1—C2—O14A−136.3 (4)C2—C1—C15—C14163.9 (4)
C15—C1—C2—C16102.2 (5)C5—C4—C15—O3−62.9 (5)
C15—C1—C2—C3−24.0 (5)C3—C4—C15—O371.6 (4)
C23—O12—C3—C4−125.1 (4)C5—C4—C15—C1−175.5 (4)
C23—O12—C3—C2118.8 (4)C3—C4—C15—C1−41.1 (4)
O14B—C2—C3—O12−106.0 (13)C5—C4—C15—C1464.0 (5)
O14A—C2—C3—O12−133.0 (4)C3—C4—C15—C14−161.6 (4)
C16—C2—C3—O12−5.0 (5)O2—C14—C15—O349.6 (4)
C1—C2—C3—O12118.2 (4)C13—C14—C15—O3173.1 (3)
O14B—C2—C3—C4134.2 (13)O2—C14—C15—C1166.4 (3)
O14A—C2—C3—C4107.1 (4)C13—C14—C15—C1−70.0 (5)
C16—C2—C3—C4−124.9 (4)O2—C14—C15—C4−78.9 (4)
C1—C2—C3—C4−1.7 (5)C13—C14—C15—C444.7 (5)
O12—C3—C4—C15−93.2 (4)C3—O12—C23—O131.4 (8)
C2—C3—C4—C1526.7 (4)C3—O12—C23—C24177.8 (4)
O12—C3—C4—C541.4 (5)C5—O5—C25—O42.2 (6)
C2—C3—C4—C5161.3 (4)C5—O5—C25—C26−176.2 (3)
C25—O5—C5—C679.4 (4)O4—C25—C26—C3112.9 (7)
C25—O5—C5—C4−155.9 (3)O5—C25—C26—C31−168.7 (4)
C15—C4—C5—O554.8 (5)O4—C25—C26—C27−161.3 (5)
C3—C4—C5—O5−74.2 (5)O5—C25—C26—C2717.0 (6)
C15—C4—C5—C6178.7 (4)C31—C26—C27—C280.1 (7)
C3—C4—C5—C649.8 (5)C25—C26—C27—C28174.4 (5)
O5—C5—C6—C177.8 (6)C26—C27—C28—C29−0.4 (8)
C4—C5—C6—C17−115.7 (5)C27—C28—C29—C301.5 (9)
O5—C5—C6—C7−168.1 (3)C28—C29—C30—C31−2.2 (9)
C4—C5—C6—C768.4 (5)C29—C30—C31—C261.9 (8)
C32—O10—C7—C697.3 (4)C27—C26—C31—C30−0.9 (7)
C32—O10—C7—C8−142.2 (4)C25—C26—C31—C30−175.2 (4)
C17—C6—C7—O1036.6 (6)C7—O10—C32—O117.8 (7)
C5—C6—C7—O10−147.4 (4)C7—O10—C32—C33−169.2 (4)
C17—C6—C7—C8−83.7 (5)O11—C32—C33—C35118.8 (7)
C5—C6—C7—C892.4 (4)O10—C32—C33—C35−64.4 (7)
C36—O6—C8—C993.3 (5)O11—C32—C33—C34−9.7 (8)
C36—O6—C8—C7−140.1 (4)O10—C32—C33—C34167.1 (5)
O10—C7—C8—O6−30.8 (5)C8—O6—C36—O7−6.2 (7)
C6—C7—C8—O689.7 (4)C8—O6—C36—C37175.0 (4)
O10—C7—C8—C992.3 (4)C9—O8—C38—O9−0.4 (7)
C6—C7—C8—C9−147.2 (4)C9—O8—C38—C39−179.1 (4)
C38—O8—C9—C8−123.8 (4)C14—O2—C40—O15.7 (7)
C38—O8—C9—C10109.4 (4)C14—O2—C40—C41−175.4 (3)
O6—C8—C9—O880.8 (4)O1—C40—C41—C42−169.8 (5)
C7—C8—C9—O8−40.2 (5)O2—C40—C41—C4211.3 (6)
O6—C8—C9—C10−156.1 (4)O1—C40—C41—C469.5 (7)
C7—C8—C9—C1082.9 (4)O2—C40—C41—C46−169.4 (4)
O8—C9—C10—C1160.7 (5)C46—C41—C42—C430.4 (7)
C8—C9—C10—C11−61.3 (5)C40—C41—C42—C43179.7 (4)
O8—C9—C10—C18−174.6 (4)C41—C42—C43—C440.5 (8)
C8—C9—C10—C1863.3 (5)C42—C43—C44—C45−0.4 (8)
O8—C9—C10—C19−58.2 (5)C43—C44—C45—C46−0.7 (8)
C8—C9—C10—C19179.8 (4)C44—C45—C46—C411.7 (7)
C18—C10—C11—C126.6 (7)C42—C41—C46—C45−1.5 (7)
C19—C10—C11—C12−112.6 (5)C40—C41—C46—C45179.1 (4)
C9—C10—C11—C12128.5 (5)C16—C2—O14A—C21A−62.3 (7)
C10—C11—C12—C13172.8 (4)C3—C2—O14A—C21A67.0 (7)
C11—C12—C13—C20−105.5 (5)C1—C2—O14A—C21A177.7 (6)
C11—C12—C13—C14131.9 (5)C2—O14A—C21A—O15A3.8 (11)
C40—O2—C14—C13116.5 (4)C2—O14A—C21A—C22A−177.6 (7)
C40—O2—C14—C15−114.2 (4)C16—C2—O14B—C21B179 (2)
C12—C13—C14—O234.6 (4)C3—C2—O14B—C21B−63 (2)
C20—C13—C14—O2−87.1 (4)C1—C2—O14B—C21B65 (3)
C12—C13—C14—C15−89.0 (4)C2—O14B—C21B—O15B−10 (4)
C20—C13—C14—C15149.3 (4)C2—O14B—C21B—C22B161 (3)
C2—C1—C15—O3−77.5 (4)
D—H···AD—HH···AD···AD—H···A
O3—H3A···O50.822.112.821 (4)145
C1—H1A···O15B0.972.252.78 (2)113
C3—H3B···O110.982.473.330 (6)147
C4—H4A···O15B0.982.543.12 (2)118
C16—H16A···O30.962.623.222 (6)121
C16—H16C···O15A0.962.392.946 (7)116
C37—H37B···O9i0.962.393.239 (8)147
C37—H37C···O15Bii0.962.192.92 (2)132
  14 in total

Review 1.  Chemical and pharmacological research of the plants in genus Euphorbia.

Authors:  Qing-Wen Shi; Xiao-Hui Su; Hiromasa Kiyota
Journal:  Chem Rev       Date:  2008-09-25       Impact factor: 60.622

Review 2.  Euphorbia diterpenes: isolation, structure, biological activity, and synthesis (2008-2012).

Authors:  Andrea Vasas; Judit Hohmann
Journal:  Chem Rev       Date:  2014-07-18       Impact factor: 60.622

3.  ES2 enhances the efficacy of chemotherapeutic agents in ABCB1-overexpressing cancer cells in vitro and in vivo.

Authors:  Yanfen Fang; Juanjuan Sun; Xing Zhong; Rui Hu; Jie Gao; Guanfu Duan; Changge Ji; Lijuan Chen; Wanli Zhang; Chunxiao Miao; Haji Akber Aisa; Xiongwen Zhang
Journal:  Pharmacol Res       Date:  2017-11-07       Impact factor: 7.658

4.  Discovery and biological evaluation of a new family of potent modulators of multidrug resistance: reversal of multidrug resistance of mouse lymphoma cells by new natural jatrophane diterpenoids isolated from Euphorbia species.

Authors:  Judit Hohmann; Joseph Molnár; Dóra Rédei; Ferenc Evanics; Peter Forgo; Alajos Kálmán; Gyula Argay; Pál Szabó
Journal:  J Med Chem       Date:  2002-06-06       Impact factor: 7.446

5.  Jatrophane diterpenes as inhibitors of chikungunya virus replication: structure-activity relationship and discovery of a potent lead.

Authors:  Louis-Félix Nothias-Scaglia; Pascal Retailleau; Julien Paolini; Christophe Pannecouque; Johan Neyts; Vincent Dumontet; Fanny Roussi; Pieter Leyssen; Jean Costa; Marc Litaudon
Journal:  J Nat Prod       Date:  2014-06-13       Impact factor: 4.050

6.  Euphorbia dendroides Latex as a Source of Jatrophane Esters: Isolation, Structural Analysis, Conformational Study, and Anti-CHIKV Activity.

Authors:  Mélissa Esposito; Louis-Félix Nothias; Hirsto Nedev; Jean-François Gallard; Pieter Leyssen; Pascal Retailleau; Jean Costa; Fanny Roussi; Bogdan I Iorga; Julien Paolini; Marc Litaudon
Journal:  J Nat Prod       Date:  2016-10-27       Impact factor: 4.050

7.  Jatrophane diterpenoid esters from Euphorbia sororia serving as multidrug resistance reversal agents.

Authors:  Dongli Lu; Yongqiang Liu; Haji Akber Aisa
Journal:  Fitoterapia       Date:  2013-11-27       Impact factor: 2.882

8.  Crystal structure refinement with SHELXL.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr C Struct Chem       Date:  2015-01-01       Impact factor: 1.172

9.  Use of intensity quotients and differences in absolute structure refinement.

Authors:  Simon Parsons; Howard D Flack; Trixie Wagner
Journal:  Acta Crystallogr B Struct Sci Cryst Eng Mater       Date:  2013-05-17

10.  The Cambridge Structural Database.

Authors:  Colin R Groom; Ian J Bruno; Matthew P Lightfoot; Suzanna C Ward
Journal:  Acta Crystallogr B Struct Sci Cryst Eng Mater       Date:  2016-04-01
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