Literature DB >> 29850037

Crystal structure of ethyl 2-methyl-5,10-dioxo-4-phenyl-5,10-di-hydro-4H-11-thia-1,4a-di-aza-benzo[b]fluorene-3-carb-oxy-late.

Yegor Yartsev1, Pavel Lyubashov2, Vyacheslav Povstyanoy2, Mykhailo Povstyaniy2, Iryna Lebedyeva3.   

Abstract

The title compound, C24H18N2O4S, crystallizes in the ortho-rhom-bic P212121 space group, indicating the existence of only one enanti-omer with an S configuration of the chiral center in the crystal phase. The di-hydro-pyrimidine ring adopts a twist-boat conformation while the quinone ring is slightly non-planar. In the crystal, mol-ecules are linked by weak C-H⋯O and C-H⋯S hydrogen bonds and C-H⋯π inter-actions. In addition, a short inter-molecular S⋯N contact of 3.250 (3) Å indicates an inter-action between the S atom and the π-system of the thia-zole ring.

Entities:  

Keywords:  DHPM; crystal structure; di­hydro­pyrimidine; enanti­omer

Year:  2018        PMID: 29850037      PMCID: PMC5956320          DOI: 10.1107/S2056989018000117

Source DB:  PubMed          Journal:  Acta Crystallogr E Crystallogr Commun


Chemical context

The three-component Biginelli reaction allows the assembly of a wide variety of di­hydro­pyrimidine (DHPM) compounds that can be modified easily depending on the starting materials used during the reaction (Nagarajaiah et al., 2016 ▸). DHPMs exhibit anti­bacterial (Wani et al., 2017 ▸) and anti­fungal properties (Akhaja & Raval, 2012 ▸) and their thio­analogues such as monastrol are being used as inhibitors of mitotic kinesin Eg5 in the treatment of breast and ovarian tumors (Bobylev et al., 2017 ▸; Duan et al., 2015 ▸). In this work we investigated reactivity of thioDHPMs 1 in their reaction with the di-halogen-substituted nucleophile 2. It was expected that the reaction would proceed with substitution of one or both chlorine atoms and the formation of a thia­zole ring in the product 3 (Fig. 1 ▸).
Figure 1

Synthesis of 3.

Structural commentary

Compound 3 crystallizes in the non-centrosymmetric chiral space group P212121. This indicates the existence of only one enanti­omer in the crystal with an S-configuration of the C12 chiral center according to the Flack parameter (Parsons et al., 2013 ▸). The quinone ring is slightly non-planar (Fig. 2 ▸). Its conformation can be described as a flattened asymmetric screw-boat with the C7 and C10 atoms deviating by 0.053 (3) and 0.082 (3) Å from the mean plane through the remaining ring atoms. This non-planarity may be caused by the formation of the weak intra­molecular C12—H12⋯O2 hydrogen bond. Taking into account high conformational flexibility of the quinone ring (Shishkin, 1997 ▸; Kovalevsky et al., 1998 ▸), it could be suggested that the out-of plane deformation of the ring represents the easiest way for relaxation of its structure because of steric clashes.
Figure 2

The mol­ecular structure of compound 3 with the atom labelling. Displacement ellipsoids are drawn at the 50% probability level.

The di­hydro­pyrimidine ring adopts a twist-boat conformation with puckering parameters (Zefirov et al., 1990 ▸) S = 0.34, Θ = 61.5° and ψ = 12.5°. The deviations of the C11 and N1 atoms from the mean plane through the remaining ring atoms are 0.307 (2) and 0.458 (2) Å, respectively. Such a conformation is common for 1,6-di­hydro­aromatic heterocycles (Shishkin, 1998 ▸). However, the presence of three vicinal substituents results in some twisting of the N2—C11 and C13—C14 endocyclic double bonds [the C14—N2—C11—N1 and C12—C13—C14—N2 torsion angles are −7.6 (4) and 4.5 (4)°] because of steric repulsion [the intra­molecular O4⋯C24 contact is 2.739 (4) Å, shorter than the sum of the van der Waals radii (2.87 Å; Zefirov, 1997 ▸). The phenyl substituent has an axial orientation with respect to the di­hydro­pyrimidine ring [C11—N1—C12—C15 = −98.7 (3)°] and is almost coplanar with the C12—H12 bond (C20—C15—C12—H12 = −8°) despite the shorten intra­molecular H12⋯H20 contact of 2.30 Å (sum of van der Waals radii = 2.32 Å). The carbonyl group of the ester substituent is rotated slightly with respect to the C13—C14 bond [C14—C13—C21—O3 = 167.2 (2)°] probably as a result of the formation of the O3⋯H12 attractive intra­molecular inter­action (2.34 Å compared to the van der Waals radii sum of 2.45 Å). The ethoxyl group has an ap–ap conformation [C13—C21—O4—C22 and C21—O4—C22—C23 torsion angles are 175.1 (2) and −160.5 (3)°, respectively].

Supra­molecular features

In the crystal, mol­ecules are linked by weak C19—H19⋯O3 and C16—H16⋯S1 hydrogen bonds and C—H⋯π inter­actions (C3—H3⋯C16 and C22—H22A⋯C2 (see Table 1 ▸). In addition, a short inter­molecular S1⋯N1(− + x,  − y, 2 − z) contact of 3.250 (3) Å (van der Waals radii sum is 3.32 Å) indicates an inter­action between the S atom and the π-system of the thia­zole ring (Fig. 3 ▸).
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯A D—HH⋯A DA D—H⋯A
C12—H12⋯O20.982.362.926 (4)116
C19—H19⋯O3i 0.932.503.219 (5)134
C16—H16⋯S1ii 0.933.073.810 (4)138
C3—H3⋯C16iii 0.932.843.542 (5)133
C22—H22A⋯C2iv 0.972.883.718 (5)145

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) .

Figure 3

The view of the S⋯N inter­molecular inter­action.

Database survey

A search of the Cambridge Structural Database (Version 5.37, update May 2016; Groom et al., 2016 ▸) did not reveal any compounds with a similar polycyclic fragment.

Synthesis and crystallization

Ethyl 6-methyl-4-phenyl-2-thioxo-1,2,3,4-tetra­hydro­pyrim­id­ine-5-carboxyl­ate 1 (0.28 g, 1 mmol) was added to a solution of 2,3-di­chloro­naphthalene-1,4-dione (0.25 g, 1.1 mmol) in DMF (20 mL) and the mixture was kept under reflux for 3 h. After that, the reaction mixture was cooled, and the precipitated solid product was filtered off and purified via recrystallization from MeOH:DMF:H2O (2:2:1) to give product 3 in the form of dark-red crystals in 78% yield (0.35 g), m.p. 520.3– 522.0 K.

Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2 ▸. All H atoms were located in difference-Fourier maps and treated as riding (C—H = 0.93–0.97 Å) with U iso(H) = nU eq(C) (n = 1.5 for CH3 and n = 1.2 for all other H atoms).
Table 2

Experimental details

Crystal data
Chemical formulaC24H18N2O4S
M r 430.46
Crystal system, space groupOrthorhombic, P212121
Temperature (K)293
a, b, c (Å)8.1038 (3), 13.3915 (6), 18.7377 (9)
V3)2033.44 (15)
Z 4
Radiation typeMo Kα
μ (mm−1)0.19
Crystal size (mm)0.14 × 0.14 × 0.12
 
Data collection
DiffractometerOxford Diffraction Xcalibur, Sapphire3
Absorption correctionMulti-scan (CrysAlis PRO; Oxford Diffraction, 2010
T min, T max 0.991, 1.000
No. of measured, independent and observed [I > 2σ(I)] reflections6202, 3574, 3160
R int 0.017
(sin θ/λ)max−1)0.594
 
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S 0.035, 0.087, 1.03
No. of reflections3574
No. of parameters282
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å−3)0.13, −0.14
Absolute structureFlack x determined using 1207 quotients [(I +)−(I )]/[(I +)+(I )] (Parsons et al., 2013).
Absolute structure parameter0.00 (4)

Computer programs: (CrysAlis PRO; Oxford Diffraction, 2010 ▸, SHELXT (Sheldrick, 2015a ▸), SHELXL2014/7 (Sheldrick, 2015b ▸), Mercury (Macrae et al., 2008 ▸), publCIF (Westrip, 2010 ▸).

Crystal structure: contains datablock(s) I. DOI: 10.1107/S2056989018000117/zq2240sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S2056989018000117/zq2240Isup2.hkl CCDC reference: 1814348 Additional supporting information: crystallographic information; 3D view; checkCIF report
C24H18N2O4SDx = 1.406 Mg m3
Mr = 430.46Mo Kα radiation, λ = 0.71073 Å
Orthorhombic, P212121Cell parameters from 3614 reflections
a = 8.1038 (3) Åθ = 3.0–29.0°
b = 13.3915 (6) ŵ = 0.19 mm1
c = 18.7377 (9) ÅT = 293 K
V = 2033.44 (15) Å3Block, red
Z = 40.14 × 0.14 × 0.12 mm
F(000) = 896
Oxford Diffraction Xcalibur, Sapphire3 diffractometer3574 independent reflections
Radiation source: Enhance (Mo) X-ray Source3160 reflections with I > 2σ(I)
Detector resolution: 16.1827 pixels mm-1Rint = 0.017
ω–scanθmax = 25.0°, θmin = 3.0°
Absorption correction: multi-scan (CrysAlisPro; Oxford Diffraction, 2010h = −9→9
Tmin = 0.991, Tmax = 1.000k = −13→15
6202 measured reflectionsl = −22→22
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.035H-atom parameters constrained
wR(F2) = 0.087w = 1/[σ2(Fo2) + (0.0436P)2 + 0.1932P] where P = (Fo2 + 2Fc2)/3
S = 1.03(Δ/σ)max < 0.001
3574 reflectionsΔρmax = 0.13 e Å3
282 parametersΔρmin = −0.14 e Å3
0 restraintsAbsolute structure: Flack x determined using 1207 quotients [(I+)-(I-)]/[(I+)+(I-)] (Parsons et al., 2013).
Primary atom site location: difference Fourier mapAbsolute structure parameter: 0.00 (4)
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.
xyzUiso*/Ueq
S10.70278 (10)0.68425 (6)0.96988 (5)0.0577 (2)
O10.7487 (4)0.6165 (2)0.81545 (17)0.0925 (9)
O21.0119 (3)0.97193 (18)0.87923 (13)0.0727 (7)
O31.0162 (4)1.08986 (18)1.09805 (13)0.0801 (8)
O40.9283 (2)1.03242 (17)1.20226 (11)0.0561 (6)
N10.8225 (3)0.86059 (16)0.98532 (12)0.0414 (5)
N20.7164 (3)0.78761 (17)1.09161 (14)0.0499 (6)
C10.9415 (4)0.8572 (3)0.78826 (16)0.0527 (8)
C21.0157 (4)0.9143 (3)0.73617 (18)0.0670 (10)
H21.06380.97520.74780.080*
C31.0179 (5)0.8804 (4)0.6664 (2)0.0827 (12)
H31.06730.91910.63110.099*
C40.9489 (5)0.7914 (4)0.6487 (2)0.0890 (14)
H40.94930.77040.60140.107*
C50.8785 (5)0.7318 (4)0.7004 (2)0.0766 (11)
H50.83380.67010.68810.092*
C60.8745 (4)0.7644 (3)0.77107 (18)0.0589 (9)
C70.8000 (4)0.7003 (3)0.82700 (19)0.0604 (8)
C80.7887 (4)0.7446 (2)0.89746 (17)0.0497 (7)
C90.8483 (3)0.8355 (2)0.91469 (16)0.0428 (7)
C100.9400 (4)0.8963 (2)0.86233 (17)0.0499 (7)
C110.7472 (3)0.7863 (2)1.02436 (18)0.0450 (7)
C120.8429 (3)0.96026 (19)1.01698 (15)0.0415 (6)
H120.94940.98721.00140.050*
C130.8477 (3)0.9481 (2)1.09764 (15)0.0415 (6)
C140.7823 (3)0.8678 (2)1.13005 (16)0.0446 (7)
C150.7081 (4)1.0300 (2)0.99115 (14)0.0438 (6)
C160.5438 (4)1.0063 (3)0.99771 (17)0.0565 (8)
H160.51330.94561.01790.068*
C170.4239 (5)1.0717 (3)0.9747 (2)0.0722 (10)
H170.31311.05480.97920.087*
C180.4674 (6)1.1617 (3)0.9451 (2)0.0774 (11)
H180.38641.20600.92980.093*
C190.6310 (6)1.1857 (3)0.9383 (2)0.0832 (12)
H190.66111.24660.91830.100*
C200.7504 (5)1.1206 (2)0.9608 (2)0.0660 (9)
H200.86111.13740.95560.079*
C210.9387 (4)1.0299 (2)1.13135 (16)0.0471 (7)
C221.0268 (4)1.1067 (3)1.23806 (18)0.0609 (9)
H22B0.97351.17141.23550.073*
H22A1.13461.11171.21580.073*
C231.0436 (5)1.0742 (3)1.3141 (2)0.0815 (12)
H23B0.93591.06651.33480.122*
H23C1.10431.12361.34030.122*
H23A1.10121.01161.31600.122*
C240.7765 (4)0.8499 (2)1.20923 (17)0.0594 (8)
H24C0.88580.85541.22870.089*
H24A0.73410.78421.21840.089*
H24B0.70610.89861.23120.089*
U11U22U33U12U13U23
S10.0570 (4)0.0437 (4)0.0725 (5)−0.0110 (4)0.0073 (4)−0.0060 (4)
O10.105 (2)0.0743 (17)0.098 (2)−0.0213 (16)0.0155 (17)−0.0383 (17)
O20.0955 (17)0.0606 (14)0.0620 (14)−0.0237 (14)0.0224 (14)−0.0034 (13)
O30.121 (2)0.0638 (14)0.0554 (13)−0.0474 (16)−0.0102 (15)0.0097 (13)
O40.0569 (13)0.0627 (13)0.0486 (11)−0.0122 (11)−0.0002 (10)−0.0033 (11)
N10.0428 (12)0.0360 (12)0.0452 (13)−0.0025 (10)0.0018 (11)0.0033 (11)
N20.0532 (14)0.0423 (13)0.0542 (15)−0.0095 (12)0.0019 (13)0.0078 (12)
C10.0458 (16)0.064 (2)0.0482 (17)0.0134 (15)−0.0009 (14)−0.0004 (16)
C20.065 (2)0.082 (3)0.0540 (19)0.0140 (19)0.0023 (18)0.007 (2)
C30.082 (3)0.115 (4)0.051 (2)0.020 (3)0.001 (2)0.009 (2)
C40.080 (3)0.140 (4)0.047 (2)0.022 (3)−0.003 (2)−0.012 (3)
C50.069 (2)0.096 (3)0.065 (2)0.015 (2)−0.008 (2)−0.024 (2)
C60.0482 (17)0.073 (2)0.0555 (19)0.0138 (16)−0.0033 (16)−0.0110 (18)
C70.0503 (16)0.060 (2)0.071 (2)0.0030 (17)0.0007 (17)−0.0185 (18)
C80.0419 (15)0.0473 (16)0.0598 (18)0.0009 (14)0.0013 (15)−0.0053 (15)
C90.0374 (13)0.0410 (16)0.0501 (16)0.0042 (11)−0.0016 (12)−0.0006 (14)
C100.0487 (17)0.0497 (18)0.0514 (17)0.0037 (15)0.0036 (14)0.0034 (15)
C110.0373 (14)0.0371 (15)0.0605 (19)−0.0037 (11)0.0011 (13)0.0068 (15)
C120.0478 (15)0.0309 (13)0.0458 (15)−0.0033 (11)0.0024 (12)0.0032 (13)
C130.0421 (14)0.0383 (14)0.0441 (15)−0.0003 (12)−0.0025 (12)0.0044 (13)
C140.0417 (14)0.0446 (15)0.0475 (16)−0.0003 (13)0.0005 (14)0.0079 (14)
C150.0537 (16)0.0373 (15)0.0405 (14)0.0042 (13)−0.0029 (13)0.0013 (12)
C160.0561 (18)0.0533 (17)0.0600 (18)0.0068 (15)−0.0048 (15)0.0014 (16)
C170.063 (2)0.081 (3)0.072 (2)0.0174 (19)−0.014 (2)−0.007 (2)
C180.099 (3)0.068 (2)0.065 (2)0.037 (2)−0.022 (2)−0.001 (2)
C190.107 (3)0.056 (2)0.087 (3)0.019 (2)−0.009 (3)0.020 (2)
C200.074 (2)0.0463 (18)0.078 (2)0.0044 (15)−0.0003 (19)0.0149 (18)
C210.0526 (16)0.0405 (16)0.0482 (16)−0.0021 (14)−0.0042 (14)0.0065 (15)
C220.062 (2)0.062 (2)0.0587 (19)−0.0050 (17)−0.0081 (17)−0.0109 (17)
C230.085 (3)0.101 (3)0.058 (2)−0.009 (2)−0.004 (2)−0.010 (2)
C240.071 (2)0.0556 (18)0.0518 (18)−0.0078 (16)0.0021 (17)0.0139 (16)
S1—C81.726 (3)C12—C151.517 (4)
S1—C111.743 (3)C12—C131.521 (4)
O1—C71.216 (4)C12—H120.9800
O2—C101.211 (4)C13—C141.344 (4)
O3—C211.195 (3)C13—C211.463 (4)
O4—C211.332 (4)C14—C241.504 (4)
O4—C221.441 (4)C15—C161.374 (4)
N1—C111.378 (3)C15—C201.383 (4)
N1—C91.381 (4)C16—C171.377 (4)
N1—C121.470 (4)C16—H160.9300
N2—C111.285 (4)C17—C181.373 (6)
N2—C141.399 (4)C17—H170.9300
C1—C21.378 (5)C18—C191.371 (6)
C1—C61.394 (5)C18—H180.9300
C1—C101.484 (4)C19—C201.369 (5)
C2—C31.384 (5)C19—H190.9300
C2—H20.9300C20—H200.9300
C3—C41.358 (6)C22—C231.497 (5)
C3—H30.9300C22—H22B0.9700
C4—C51.378 (6)C22—H22A0.9700
C4—H40.9300C23—H23B0.9600
C5—C61.395 (5)C23—H23C0.9600
C5—H50.9300C23—H23A0.9600
C6—C71.483 (5)C24—H24C0.9600
C7—C81.451 (5)C24—H24A0.9600
C8—C91.348 (4)C24—H24B0.9600
C9—C101.476 (4)
C8—S1—C1190.57 (14)C14—C13—C21127.1 (3)
C21—O4—C22116.5 (2)C14—C13—C12121.6 (3)
C11—N1—C9113.6 (2)C21—C13—C12111.2 (2)
C11—N1—C12119.4 (2)C13—C14—N2122.2 (3)
C9—N1—C12126.2 (2)C13—C14—C24125.9 (3)
C11—N2—C14116.2 (2)N2—C14—C24111.9 (3)
C2—C1—C6120.1 (3)C16—C15—C20118.7 (3)
C2—C1—C10118.0 (3)C16—C15—C12121.8 (3)
C6—C1—C10121.9 (3)C20—C15—C12119.5 (3)
C1—C2—C3119.5 (4)C15—C16—C17120.6 (3)
C1—C2—H2120.3C15—C16—H16119.7
C3—C2—H2120.3C17—C16—H16119.7
C4—C3—C2120.8 (4)C18—C17—C16120.2 (4)
C4—C3—H3119.6C18—C17—H17119.9
C2—C3—H3119.6C16—C17—H17119.9
C3—C4—C5120.5 (4)C19—C18—C17119.5 (3)
C3—C4—H4119.7C19—C18—H18120.3
C5—C4—H4119.7C17—C18—H18120.3
C4—C5—C6119.7 (4)C20—C19—C18120.4 (4)
C4—C5—H5120.2C20—C19—H19119.8
C6—C5—H5120.2C18—C19—H19119.8
C1—C6—C5119.3 (4)C19—C20—C15120.7 (4)
C1—C6—C7120.7 (3)C19—C20—H20119.7
C5—C6—C7120.0 (4)C15—C20—H20119.7
O1—C7—C8121.2 (3)O3—C21—O4122.5 (3)
O1—C7—C6123.2 (3)O3—C21—C13122.8 (3)
C8—C7—C6115.6 (3)O4—C21—C13114.7 (3)
C9—C8—C7124.4 (3)O4—C22—C23107.0 (3)
C9—C8—S1112.3 (2)O4—C22—H22B110.3
C7—C8—S1123.3 (2)C23—C22—H22B110.3
C8—C9—N1113.3 (3)O4—C22—H22A110.3
C8—C9—C10121.3 (3)C23—C22—H22A110.3
N1—C9—C10125.4 (3)H22B—C22—H22A108.6
O2—C10—C9122.0 (3)C22—C23—H23B109.5
O2—C10—C1122.4 (3)C22—C23—H23C109.5
C9—C10—C1115.5 (3)H23B—C23—H23C109.5
N2—C11—N1126.6 (3)C22—C23—H23A109.5
N2—C11—S1123.1 (2)H23B—C23—H23A109.5
N1—C11—S1110.3 (2)H23C—C23—H23A109.5
N1—C12—C15110.4 (2)C14—C24—H24C109.5
N1—C12—C13107.9 (2)C14—C24—H24A109.5
C15—C12—C13113.7 (2)H24C—C24—H24A109.5
N1—C12—H12108.2C14—C24—H24B109.5
C15—C12—H12108.2H24C—C24—H24B109.5
C13—C12—H12108.2H24A—C24—H24B109.5
C6—C1—C2—C32.3 (5)C9—N1—C11—N2176.2 (3)
C10—C1—C2—C3−179.4 (3)C12—N1—C11—N2−13.3 (4)
C1—C2—C3—C4−0.4 (6)C9—N1—C11—S1−1.8 (3)
C2—C3—C4—C5−1.5 (6)C12—N1—C11—S1168.65 (19)
C3—C4—C5—C61.6 (6)C8—S1—C11—N2−177.5 (3)
C2—C1—C6—C5−2.2 (5)C8—S1—C11—N10.6 (2)
C10—C1—C6—C5179.6 (3)C11—N1—C12—C15−98.7 (3)
C2—C1—C6—C7177.6 (3)C9—N1—C12—C1570.4 (3)
C10—C1—C6—C7−0.6 (4)C11—N1—C12—C1326.1 (3)
C4—C5—C6—C10.3 (5)C9—N1—C12—C13−164.8 (2)
C4—C5—C6—C7−179.5 (3)N1—C12—C13—C14−22.3 (4)
C1—C6—C7—O1−175.6 (3)C15—C12—C13—C14100.5 (3)
C5—C6—C7—O14.2 (5)N1—C12—C13—C21154.3 (2)
C1—C6—C7—C85.5 (4)C15—C12—C13—C21−82.9 (3)
C5—C6—C7—C8−174.7 (3)C21—C13—C14—N2−171.5 (3)
O1—C7—C8—C9177.5 (3)C12—C13—C14—N24.5 (4)
C6—C7—C8—C9−3.6 (5)C21—C13—C14—C245.7 (5)
O1—C7—C8—S1−0.2 (5)C12—C13—C14—C24−178.3 (3)
C6—C7—C8—S1178.7 (2)C11—N2—C14—C1311.8 (4)
C11—S1—C8—C90.7 (2)C11—N2—C14—C24−165.7 (3)
C11—S1—C8—C7178.6 (3)N1—C12—C15—C1654.1 (4)
C7—C8—C9—N1−179.8 (3)C13—C12—C15—C16−67.3 (4)
S1—C8—C9—N1−1.9 (3)N1—C12—C15—C20−126.6 (3)
C7—C8—C9—C10−3.3 (4)C13—C12—C15—C20112.0 (3)
S1—C8—C9—C10174.6 (2)C20—C15—C16—C17−0.2 (5)
C11—N1—C9—C82.4 (3)C12—C15—C16—C17179.1 (3)
C12—N1—C9—C8−167.3 (3)C15—C16—C17—C18−0.2 (5)
C11—N1—C9—C10−173.9 (2)C16—C17—C18—C190.4 (6)
C12—N1—C9—C1016.4 (4)C17—C18—C19—C200.0 (7)
C8—C9—C10—O2−170.5 (3)C18—C19—C20—C15−0.4 (6)
N1—C9—C10—O25.5 (5)C16—C15—C20—C190.5 (5)
C8—C9—C10—C18.0 (4)C12—C15—C20—C19−178.8 (3)
N1—C9—C10—C1−175.9 (3)C22—O4—C21—O3−5.1 (5)
C2—C1—C10—O2−5.8 (5)C22—O4—C21—C13175.1 (2)
C6—C1—C10—O2172.5 (3)C14—C13—C21—O3167.2 (3)
C2—C1—C10—C9175.7 (3)C12—C13—C21—O3−9.1 (4)
C6—C1—C10—C9−6.1 (4)C14—C13—C21—O4−12.9 (4)
C14—N2—C11—N1−7.6 (4)C12—C13—C21—O4170.8 (2)
C14—N2—C11—S1170.2 (2)C21—O4—C22—C23−160.5 (3)
D—H···AD—HH···AD···AD—H···A
C12—H12···O20.982.362.926 (4)116
C19—H19···O3i0.932.503.219 (5)134
C16—H16···S1ii0.933.073.810 (4)138
C3—H3···C16iii0.932.843.542 (5)133
C22—H22A···C2iv0.972.883.718 (5)145
  7 in total

1.  Kinesin-5 Blocker Monastrol Protects Against Bortezomib-Induced Peripheral Neurotoxicity.

Authors:  Ilja Bobylev; Dominik Peters; Maulik Vyas; Mohammed Barham; Ines Klein; Elke Pogge von Strandmann; Wolfram F Neiss; Helmar C Lehmann
Journal:  Neurotox Res       Date:  2017-06-13       Impact factor: 3.911

2.  Flucytosine analogues obtained through Biginelli reaction as efficient combinative antifungal agents.

Authors:  Mohmmad Younus Wani; Aijaz Ahmad; Santosh Kumar; Abilio J F N Sobral
Journal:  Microb Pathog       Date:  2017-02-09       Impact factor: 3.738

3.  Centrin: another target of monastrol, an inhibitor of mitotic spindle.

Authors:  Lian Duan; Tong-Qing Wang; Wei Bian; Wen Liu; Yue Sun; Bin-Sheng Yang
Journal:  Spectrochim Acta A Mol Biomol Spectrosc       Date:  2014-09-03       Impact factor: 4.098

4.  SHELXT - integrated space-group and crystal-structure determination.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr A Found Adv       Date:  2015-01-01       Impact factor: 2.290

5.  Crystal structure refinement with SHELXL.

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

6.  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

7.  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
  7 in total

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