research communications
Crystal structures of ethyl {2-[4-(4-isopropylphenyl)thiazol-2-yl]phenyl}carbamate and ethyl {2-[4-(3-nitrophenyl)thiazol-2-yl]phenyl}carbamate
aLaboratory of Functional Heterocyclic Compounds, Togliatti State University, 14 Belorusskaya St., Togliatti 445020, Russian Federation, bNational Research Centre "Kurchatov Institute", 1 Acad. Kurchatov Sq., Moscow 123182, Russian Federation, cInorganic Chemistry Department, Peoples' Friendship University of Russia, 6 Miklukho-Maklay St., Moscow 117198, Russian Federation, and dX-Ray Structural Centre, A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov St., B–334, Moscow 119991, Russian Federation
*Correspondence e-mail: vnkhrustalev@gmail.com
The title compounds, C21H22N2O2S (I) and C18H15N3O4S (II), are structural analogs of the alkaloid Thiosporine B. Both molecules adopt a near-planar V-shaped conformation, which is consolidated by intramolecular N—H⋯N and C—H⋯O hydrogen bonds. The of (I) consists of mlecular stacks along the a axis, in which the molecules are linked to each other by π(S)⋯π(C) interactions. In the crystal of (II), molecules are linked into chains by C—H⋯O hydrogen bonds and the chains are cross-linked into (100) sheets by π–π stacking interactions.
Keywords: crystal structure; Thiosporine B analogs; thiazoles; carbamates; hydrogen bonding.
1. Chemical context
Marine actinomycetes are prolific producers of biologically active natural products. This unique habitat has led to the abundant chemical diversity of metabolites that provides a foundation for the discovery of promising drug lead compounds. Among all known marine microbial ; Lam et al., 2006; Fu et al., 2011). From this resource, more than 400 new active have been isolated (Bérdy, 2005; Bull & Stach, 2007; Molinski et al., 2009). Some of them represented by abyssomycin C (Bister et al., 2004), diazepinomicin (Charan et al., 2004), salinosporamide A (Feling et al., 2003) and the marinomycins (Kwon et al., 2006) are potent antibiotics and possess novel structures. A comparatively large class of natural compounds possessing biological activity contains imidazole, thiazole, or oxazole moieties. Studies of biological activity (Zabriskie et al., 1990; Carroll et al., 1996; Taori et al., 2008) as well as a total synthesis of thiazoles containing isolated from marine microorganisms are very important directions. In many cases, the substances mentioned above have promising antitumor (Luesch et al., 2001) and antibacterial (Shimanaka et al., 1994; Yun et al., 1994) activities.
over half were produced by actinomycetes (Fenical & Jensen, 2006In this paper we report a synthetic approach to the preparation of new thiazole derivatives (I) and (II) containing aryl fragments – the structural analogs of alkaloid Thiosporine B (Fu & MacMillan, 2015) – and their investigation by single crystal X-ray diffraction.
2. Structural commentary
Compounds (I), C21H22N2O2S, and (II), C18H15N3O4S, have very similar molecular geometries (Figs. 1 and 2), allowing for the different substituents on the benzene rings. Both molecules adopt a near-planar V-shaped conformation, which is consolidated by intramolecular N7—H7⋯N3 and C8—H8⋯O1 hydrogen bonds (Tables 1 and 2, Figs. 1 and 2) as well as an intermolecular π–π interactions (see Section 3 below). There exists a small twist of 10.27 (15)° between the central thiazole and 4-benzene rings in (I) only. Surprisingly, the ethyl (phenyl)carbamate substituents (with the exception of some hydrogen atoms of the ethyl fragment) are perfectly coplanar with the thiazole ring in both molecules.
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The bond-length distributions within the thiazole rings of (I) and (II) are almost identical, clearly indicating that some degree of delocalization is present. These values are in good agreement with those observed in related structures (Garden et al., 2007; Sen et al., 2013; Bunev et al., 2014; Mague et al., 2014; Moreno-Fuquen et al., 2015; AaminaNaaz et al., 2015). The C—S—C angle in (I) [89.70 (12)°] and (II) [89.94 (12)°] is also very close to that in the previously reported analogous structures [89.0 (2)–90.3 (5)°; Nayak et al., 2009; Hua et al., 2014).
3. Supramolecular features
Although the similarity of the molecular geometries and types of intramolecular interactions might lead to similar packing motifs, this is not found in the case of (I) and (II). The intermolecular interactions, namely, π–π interactions and C—H⋯O hydrogen bonding, combined in a different way, give rise to various packing networks.
In (I), the crystal packing consists of stacks along the a axis (Fig. 3), in which the molecules are linked to each other by π(S1)⋯π(C7) [1 + x, y, z] interactions at distances of 3.463 (3) Å (Fig. 4). No other directional intermolecular interactions are observed in (I).
The situation in the case of (II) is quite different. The molecules of (II) form chains via C5—H5⋯O1(−x + , y − 1, z − ) hydrogen bonds (Table 1, Fig. 5). It should be pointed out that the molecules within the chains are coplanar, forming a ribbon-like motif. Further, the ribbons are packed in layers parallel to (100) via π–π stacking interactions (Fig. 6). The distance between the ribbons in the layers is 3.216 (3) Å. Importantly, the ribbons of adjacent layers are not parallel to each other, but disposed at an interplane angle of 39.91 (2)° (Fig. 6). Thus, the crystal of (II) comprises alternating layers, in which molecules are arranged in a different manner.
4. Synthesis and crystallization
A solution of ethyl (2-carbamothioylphenyl)carbamate (2.24 g, 10 mmol) and the appropriately substituted phenacyl bromide (10 mmol) in 95% EtOH (50 ml) was heated for 12 h under reflux. After cooling to room temperature, the solution was basified with saturated NaHCO3 solution to yield the expected product (I) or (II) (Fig. 7). The reaction mixture was filtered and the isolated solid was washed with water and dried in vacuo. The compounds were isolated as pale-yellow crystalline solids in 51% and 74% yield for the i-propyl (I) and nitro (II) derivatives, respectively. Single crystals of the products were obtained by slow crystallization from N,N-dimethylformamide solution.
Spectroscopic and physical data for (I): M.p. 379-381 K. FT–IR (νmax, cm−1): 3090, 1982, 1725, 1603, 1544, 1487, 1312, 1240, 1071. 1H NMR (600 MHz, DMSO-d6, 304 K): δ = 1.25 (d, 6H, J = 6.9), 1.33 (t, 3H, J = 7.1), 2.96 (h, 1H, J = 7.2), 4.21 (q, 2H, J = 7.1), 7.19 (t, 1H, J = 7.6), 7.37 (d, 2H, J = 8.2), 7.50 (t, 1H, J = 7.8), 7.92 (d, 1H, J = 7.8), 7.96 (d, 2H, J = 8.1), 8.20 (s, 1H), 8.29 (d, 1H, J = 8.3), 12.02 (s, 1H). Analysis calculated for C21H22N2O2S: C, 68.83; H, 6.05; N, 7.64. Found: C, 68.88; H, 5.99; N, 7.67.
Spectroscopic and physical data for (II): M.p. 478–479 K. FT–IR (νmax, cm−1): 3090, 1720, 1600, 1545, 1483, 1352, 1244, 1071. 1H NMR (600 MHz, DMSO-d6, 304 K): δ = 1.31 (t, 3H, J = 7.1), 4.23 (q, 2H, J = 7.1), 7.23 (t, 1H, J = 8.0), 7.49–7.64 (m, 1H), 7.83 (t, 1H, J = 8.0), 7.99 (d, 1H, J = 7.9), 8.28 (d, 1H, J = 7.5), 8.48 (d, 1H, J = 7.9), 8.85 (s, 1H), 11.65 (s, 1H). Analysis calculated for C18H15N3O4S: C, 58.53; H, 4.09; N, 11.38. Found: C, 58.59; H, 4.13; N, 11.47.
5. Refinement
Crystal data, data collection and structure . X-ray diffraction studies were carried out on the `Belok' beamline (λ = 0.96990 Å) of the National Research Center `Kurchatov Institute' (Moscow, Russian Federation) using a MAR CCD detector. For each compound, a total of 360 images were collected using an oscillation range of 1.0° (φ scan mode) and corrected for absorption using the SCALA program (Evans, 2006). The data were indexed, integrated and scaled using the utility iMOSFLM in the program CCP4 (Battye et al., 2011).
details are summarized in Table 3The hydrogen atoms of the amino groups were localized in difference-Fourier maps and refined in isotropic approximation with the constraint Uiso(H) = 1.2Ueq(N). The other hydrogen atoms were placed in calculated positions with C—H = 0.95–1.00 Å and refined using a riding model with Uiso(H) = 1.5Ueq(C) for the methyl group and 1.2Ueq(C) for the other groups.
Supporting information
https://doi.org/10.1107/S2056989016013104/hb7607sup1.cif
contains datablocks global, I, II. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989016013104/hb7607Isup2.hkl
Structure factors: contains datablock II. DOI: https://doi.org/10.1107/S2056989016013104/hb7607IIsup3.hkl
Supporting information file. DOI: https://doi.org/10.1107/S2056989016013104/hb7607Isup4.cml
Supporting information file. DOI: https://doi.org/10.1107/S2056989016013104/hb7607IIsup5.cml
For both compounds, data collection: Automar (MarXperts, 2015); cell
iMosflm (Battye et al., 2011); data reduction: iMosflm (Battye et al., 2011); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).C21H22N2O2S | Dx = 1.293 Mg m−3 |
Mr = 366.47 | Synchrotron radiation, λ = 0.96990 Å |
Orthorhombic, P212121 | Cell parameters from 500 reflections |
a = 5.4534 (11) Å | θ = 3.5–35.0° |
b = 17.203 (3) Å | µ = 0.43 mm−1 |
c = 20.060 (4) Å | T = 100 K |
V = 1881.9 (6) Å3 | Prism, colourless |
Z = 4 | 0.20 × 0.15 × 0.10 mm |
F(000) = 776 |
MAR CCD diffractometer | 3052 reflections with I > 2σ(I) |
phi scan | Rint = 0.095 |
Absorption correction: multi-scan (SCALA; Evans, 2006) | θmax = 38.5°, θmin = 3.5° |
Tmin = 0.910, Tmax = 0.950 | h = −6→6 |
13728 measured reflections | k = −20→21 |
3971 independent reflections | l = −25→25 |
Refinement on F2 | Hydrogen site location: mixed |
Least-squares matrix: full | H atoms treated by a mixture of independent and constrained refinement |
R[F2 > 2σ(F2)] = 0.052 | w = 1/[σ2(Fo2) + (0.004P)2] where P = (Fo2 + 2Fc2)/3 |
wR(F2) = 0.123 | (Δ/σ)max < 0.001 |
S = 0.96 | Δρmax = 0.34 e Å−3 |
3971 reflections | Δρmin = −0.39 e Å−3 |
242 parameters | Extinction correction: SHELXL2014 (Sheldrick, 2015), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
0 restraints | Extinction coefficient: 0.0210 (11) |
Primary atom site location: difference Fourier map | Absolute structure: Flack x determined using 997 quotients [(I+)-(I-)]/[(I+)+(I-)] (Parsons et al., 2013) |
Secondary atom site location: difference Fourier map | Absolute structure parameter: −0.01 (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. |
x | y | z | Uiso*/Ueq | ||
S1 | 0.24911 (12) | 0.47012 (3) | 0.42460 (3) | 0.03010 (16) | |
O1 | 1.2359 (3) | 0.58830 (10) | 0.61640 (9) | 0.0352 (5) | |
O2 | 1.0633 (3) | 0.47367 (9) | 0.64975 (8) | 0.0288 (4) | |
C2 | 0.4926 (5) | 0.49392 (14) | 0.47800 (12) | 0.0259 (6) | |
N3 | 0.5248 (4) | 0.44158 (11) | 0.52534 (10) | 0.0257 (5) | |
C4 | 0.3588 (4) | 0.38088 (13) | 0.52171 (12) | 0.0239 (6) | |
C5 | 0.1972 (5) | 0.38674 (14) | 0.47016 (13) | 0.0287 (7) | |
H5 | 0.0725 | 0.3498 | 0.4606 | 0.034* | |
C6 | 0.6380 (5) | 0.56568 (14) | 0.46990 (13) | 0.0268 (6) | |
C7 | 0.8381 (5) | 0.58484 (14) | 0.51199 (12) | 0.0257 (6) | |
N7 | 0.8934 (4) | 0.53396 (11) | 0.56480 (10) | 0.0280 (5) | |
H7 | 0.787 (4) | 0.4888 (14) | 0.5664 (12) | 0.034* | |
C8 | 0.9726 (5) | 0.65255 (14) | 0.50006 (13) | 0.0319 (7) | |
H8 | 1.1061 | 0.6655 | 0.5284 | 0.038* | |
C9 | 0.9130 (5) | 0.70106 (15) | 0.44715 (13) | 0.0350 (7) | |
H9 | 1.0076 | 0.7465 | 0.4392 | 0.042* | |
C10 | 0.7167 (5) | 0.68374 (15) | 0.40576 (14) | 0.0367 (7) | |
H10 | 0.6744 | 0.7174 | 0.3700 | 0.044* | |
C11 | 0.5833 (5) | 0.61661 (14) | 0.41741 (13) | 0.0329 (7) | |
H11 | 0.4498 | 0.6046 | 0.3888 | 0.039* | |
C12 | 1.0813 (5) | 0.53798 (14) | 0.61028 (12) | 0.0261 (6) | |
C13 | 1.2512 (5) | 0.46609 (14) | 0.70045 (13) | 0.0332 (7) | |
H13A | 1.2590 | 0.5138 | 0.7280 | 0.040* | |
H13B | 1.4134 | 0.4577 | 0.6795 | 0.040* | |
C14 | 1.1827 (5) | 0.39723 (15) | 0.74298 (13) | 0.0364 (8) | |
H14A | 1.1701 | 0.3508 | 0.7149 | 0.055* | |
H14B | 1.0247 | 0.4071 | 0.7646 | 0.055* | |
H14C | 1.3090 | 0.3891 | 0.7770 | 0.055* | |
C15 | 0.3725 (4) | 0.31803 (13) | 0.57234 (12) | 0.0230 (6) | |
C16 | 0.5701 (5) | 0.31297 (14) | 0.61706 (12) | 0.0262 (6) | |
H16 | 0.7017 | 0.3489 | 0.6138 | 0.031* | |
C17 | 0.5750 (5) | 0.25610 (13) | 0.66585 (13) | 0.0265 (6) | |
H17 | 0.7105 | 0.2544 | 0.6956 | 0.032* | |
C18 | 0.3887 (5) | 0.20128 (14) | 0.67307 (12) | 0.0257 (6) | |
C19 | 0.1953 (5) | 0.20502 (14) | 0.62699 (13) | 0.0279 (7) | |
H19 | 0.0673 | 0.1676 | 0.6293 | 0.033* | |
C20 | 0.1868 (4) | 0.26245 (13) | 0.57785 (13) | 0.0249 (6) | |
H20 | 0.0526 | 0.2638 | 0.5477 | 0.030* | |
C21 | 0.3936 (5) | 0.14340 (14) | 0.73046 (14) | 0.0323 (7) | |
H21 | 0.5692 | 0.1301 | 0.7391 | 0.039* | |
C22 | 0.2582 (6) | 0.06725 (13) | 0.71601 (15) | 0.0391 (7) | |
H22A | 0.0830 | 0.0779 | 0.7101 | 0.059* | |
H22B | 0.2810 | 0.0313 | 0.7534 | 0.059* | |
H22C | 0.3241 | 0.0438 | 0.6752 | 0.059* | |
C23 | 0.2919 (6) | 0.18119 (16) | 0.79435 (14) | 0.0446 (9) | |
H23A | 0.3763 | 0.2306 | 0.8024 | 0.067* | |
H23B | 0.3188 | 0.1463 | 0.8323 | 0.067* | |
H23C | 0.1157 | 0.1907 | 0.7891 | 0.067* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0324 (3) | 0.0306 (3) | 0.0273 (3) | 0.0019 (3) | −0.0031 (3) | −0.0005 (3) |
O1 | 0.0338 (10) | 0.0280 (8) | 0.0438 (10) | −0.0087 (9) | −0.0062 (9) | 0.0005 (8) |
O2 | 0.0354 (10) | 0.0240 (8) | 0.0269 (9) | −0.0026 (8) | −0.0049 (8) | 0.0034 (8) |
C2 | 0.0264 (13) | 0.0239 (12) | 0.0275 (13) | 0.0034 (12) | 0.0057 (11) | −0.0012 (10) |
N3 | 0.0304 (12) | 0.0215 (9) | 0.0252 (11) | −0.0013 (9) | 0.0028 (9) | −0.0015 (8) |
C4 | 0.0239 (13) | 0.0204 (11) | 0.0274 (13) | −0.0015 (11) | 0.0020 (11) | −0.0061 (10) |
C5 | 0.0271 (15) | 0.0297 (12) | 0.0293 (13) | 0.0018 (12) | −0.0014 (11) | −0.0068 (11) |
C6 | 0.0330 (15) | 0.0250 (12) | 0.0224 (13) | 0.0036 (11) | 0.0037 (11) | 0.0001 (10) |
C7 | 0.0312 (14) | 0.0207 (11) | 0.0253 (13) | 0.0032 (11) | 0.0040 (11) | 0.0013 (10) |
N7 | 0.0304 (12) | 0.0245 (10) | 0.0292 (11) | −0.0036 (10) | −0.0060 (10) | 0.0024 (9) |
C8 | 0.0353 (16) | 0.0238 (12) | 0.0367 (15) | −0.0024 (12) | 0.0019 (13) | −0.0004 (11) |
C9 | 0.0432 (16) | 0.0241 (12) | 0.0378 (15) | −0.0040 (13) | 0.0107 (14) | 0.0012 (12) |
C10 | 0.0457 (17) | 0.0308 (13) | 0.0336 (14) | 0.0004 (14) | 0.0030 (14) | 0.0080 (11) |
C11 | 0.0376 (15) | 0.0328 (13) | 0.0282 (14) | 0.0020 (13) | −0.0008 (13) | 0.0019 (12) |
C12 | 0.0275 (14) | 0.0236 (12) | 0.0274 (13) | 0.0015 (12) | 0.0010 (11) | −0.0013 (10) |
C13 | 0.0336 (15) | 0.0329 (13) | 0.0330 (13) | 0.0064 (15) | −0.0064 (13) | −0.0056 (11) |
C14 | 0.0428 (18) | 0.0380 (14) | 0.0284 (14) | 0.0119 (13) | −0.0025 (12) | −0.0002 (12) |
C15 | 0.0221 (13) | 0.0235 (11) | 0.0234 (12) | 0.0025 (10) | 0.0014 (11) | −0.0056 (10) |
C16 | 0.0252 (14) | 0.0251 (12) | 0.0283 (13) | −0.0009 (12) | 0.0007 (11) | −0.0033 (10) |
C17 | 0.0238 (13) | 0.0261 (12) | 0.0296 (13) | 0.0017 (12) | 0.0002 (12) | −0.0023 (11) |
C18 | 0.0222 (13) | 0.0224 (11) | 0.0325 (14) | 0.0026 (12) | 0.0028 (12) | −0.0033 (11) |
C19 | 0.0252 (15) | 0.0227 (11) | 0.0357 (14) | −0.0007 (12) | 0.0013 (11) | −0.0035 (11) |
C20 | 0.0233 (13) | 0.0248 (11) | 0.0267 (12) | 0.0007 (10) | 0.0006 (11) | −0.0056 (10) |
C21 | 0.0278 (14) | 0.0268 (12) | 0.0424 (16) | −0.0013 (12) | −0.0010 (13) | 0.0044 (12) |
C22 | 0.0382 (16) | 0.0303 (13) | 0.0489 (16) | −0.0025 (14) | −0.0002 (16) | 0.0083 (12) |
C23 | 0.059 (2) | 0.0388 (14) | 0.0361 (16) | −0.0010 (16) | −0.0014 (15) | 0.0080 (12) |
S1—C5 | 1.724 (3) | C13—H13A | 0.9900 |
S1—C2 | 1.755 (3) | C13—H13B | 0.9900 |
O1—C12 | 1.215 (3) | C14—H14A | 0.9800 |
O2—C12 | 1.364 (3) | C14—H14B | 0.9800 |
O2—C13 | 1.449 (3) | C14—H14C | 0.9800 |
C2—N3 | 1.320 (3) | C15—C20 | 1.397 (3) |
C2—C6 | 1.476 (3) | C15—C16 | 1.405 (3) |
N3—C4 | 1.384 (3) | C16—C17 | 1.384 (3) |
C4—C5 | 1.362 (3) | C16—H16 | 0.9500 |
C4—C15 | 1.485 (3) | C17—C18 | 1.394 (3) |
C5—H5 | 0.9500 | C17—H17 | 0.9500 |
C6—C11 | 1.402 (3) | C18—C19 | 1.404 (4) |
C6—C7 | 1.419 (4) | C18—C21 | 1.522 (4) |
C7—C8 | 1.397 (3) | C19—C20 | 1.396 (3) |
C7—N7 | 1.407 (3) | C19—H19 | 0.9500 |
N7—C12 | 1.374 (3) | C20—H20 | 0.9500 |
N7—H7 | 0.97 (2) | C21—C22 | 1.531 (4) |
C8—C9 | 1.389 (4) | C21—C23 | 1.540 (4) |
C8—H8 | 0.9500 | C21—H21 | 1.0000 |
C9—C10 | 1.387 (4) | C22—H22A | 0.9800 |
C9—H9 | 0.9500 | C22—H22B | 0.9800 |
C10—C11 | 1.385 (4) | C22—H22C | 0.9800 |
C10—H10 | 0.9500 | C23—H23A | 0.9800 |
C11—H11 | 0.9500 | C23—H23B | 0.9800 |
C13—C14 | 1.507 (4) | C23—H23C | 0.9800 |
C5—S1—C2 | 89.70 (12) | C13—C14—H14A | 109.5 |
C12—O2—C13 | 115.43 (18) | C13—C14—H14B | 109.5 |
N3—C2—C6 | 125.3 (2) | H14A—C14—H14B | 109.5 |
N3—C2—S1 | 112.38 (18) | C13—C14—H14C | 109.5 |
C6—C2—S1 | 122.31 (19) | H14A—C14—H14C | 109.5 |
C2—N3—C4 | 112.9 (2) | H14B—C14—H14C | 109.5 |
C5—C4—N3 | 114.0 (2) | C20—C15—C16 | 117.6 (2) |
C5—C4—C15 | 127.3 (2) | C20—C15—C4 | 121.0 (2) |
N3—C4—C15 | 118.7 (2) | C16—C15—C4 | 121.4 (2) |
C4—C5—S1 | 110.96 (19) | C17—C16—C15 | 120.7 (2) |
C4—C5—H5 | 124.5 | C17—C16—H16 | 119.7 |
S1—C5—H5 | 124.5 | C15—C16—H16 | 119.7 |
C11—C6—C7 | 117.7 (2) | C16—C17—C18 | 122.5 (2) |
C11—C6—C2 | 119.4 (2) | C16—C17—H17 | 118.7 |
C7—C6—C2 | 122.8 (2) | C18—C17—H17 | 118.7 |
C8—C7—N7 | 122.4 (2) | C17—C18—C19 | 116.6 (2) |
C8—C7—C6 | 119.7 (2) | C17—C18—C21 | 120.6 (2) |
N7—C7—C6 | 117.9 (2) | C19—C18—C21 | 122.8 (2) |
C12—N7—C7 | 128.9 (2) | C20—C19—C18 | 121.5 (2) |
C12—N7—H7 | 117.8 (15) | C20—C19—H19 | 119.3 |
C7—N7—H7 | 113.2 (15) | C18—C19—H19 | 119.3 |
C9—C8—C7 | 120.6 (3) | C19—C20—C15 | 121.1 (2) |
C9—C8—H8 | 119.7 | C19—C20—H20 | 119.5 |
C7—C8—H8 | 119.7 | C15—C20—H20 | 119.5 |
C10—C9—C8 | 120.6 (2) | C18—C21—C22 | 114.1 (2) |
C10—C9—H9 | 119.7 | C18—C21—C23 | 110.3 (2) |
C8—C9—H9 | 119.7 | C22—C21—C23 | 110.2 (2) |
C11—C10—C9 | 118.9 (3) | C18—C21—H21 | 107.3 |
C11—C10—H10 | 120.5 | C22—C21—H21 | 107.3 |
C9—C10—H10 | 120.5 | C23—C21—H21 | 107.3 |
C10—C11—C6 | 122.4 (3) | C21—C22—H22A | 109.5 |
C10—C11—H11 | 118.8 | C21—C22—H22B | 109.5 |
C6—C11—H11 | 118.8 | H22A—C22—H22B | 109.5 |
O1—C12—O2 | 124.7 (2) | C21—C22—H22C | 109.5 |
O1—C12—N7 | 128.4 (2) | H22A—C22—H22C | 109.5 |
O2—C12—N7 | 106.9 (2) | H22B—C22—H22C | 109.5 |
O2—C13—C14 | 107.0 (2) | C21—C23—H23A | 109.5 |
O2—C13—H13A | 110.3 | C21—C23—H23B | 109.5 |
C14—C13—H13A | 110.3 | H23A—C23—H23B | 109.5 |
O2—C13—H13B | 110.3 | C21—C23—H23C | 109.5 |
C14—C13—H13B | 110.3 | H23A—C23—H23C | 109.5 |
H13A—C13—H13B | 108.6 | H23B—C23—H23C | 109.5 |
C5—S1—C2—N3 | 0.05 (19) | C2—C6—C11—C10 | −178.1 (2) |
C5—S1—C2—C6 | −179.0 (2) | C13—O2—C12—O1 | −2.2 (3) |
C6—C2—N3—C4 | 178.7 (2) | C13—O2—C12—N7 | 178.51 (19) |
S1—C2—N3—C4 | −0.3 (3) | C7—N7—C12—O1 | 3.2 (4) |
C2—N3—C4—C5 | 0.4 (3) | C7—N7—C12—O2 | −177.5 (2) |
C2—N3—C4—C15 | −179.5 (2) | C12—O2—C13—C14 | 173.7 (2) |
N3—C4—C5—S1 | −0.4 (3) | C5—C4—C15—C20 | −10.5 (4) |
C15—C4—C5—S1 | 179.5 (2) | N3—C4—C15—C20 | 169.4 (2) |
C2—S1—C5—C4 | 0.19 (19) | C5—C4—C15—C16 | 170.5 (2) |
N3—C2—C6—C11 | −179.7 (2) | N3—C4—C15—C16 | −9.5 (3) |
S1—C2—C6—C11 | −0.8 (3) | C20—C15—C16—C17 | −1.8 (3) |
N3—C2—C6—C7 | 2.3 (4) | C4—C15—C16—C17 | 177.1 (2) |
S1—C2—C6—C7 | −178.8 (2) | C15—C16—C17—C18 | 0.4 (4) |
C11—C6—C7—C8 | −0.1 (4) | C16—C17—C18—C19 | 1.5 (4) |
C2—C6—C7—C8 | 177.9 (2) | C16—C17—C18—C21 | −175.7 (2) |
C11—C6—C7—N7 | 179.9 (2) | C17—C18—C19—C20 | −2.0 (4) |
C2—C6—C7—N7 | −2.1 (4) | C21—C18—C19—C20 | 175.1 (2) |
C8—C7—N7—C12 | −2.8 (4) | C18—C19—C20—C15 | 0.7 (4) |
C6—C7—N7—C12 | 177.2 (2) | C16—C15—C20—C19 | 1.3 (3) |
N7—C7—C8—C9 | 179.6 (2) | C4—C15—C20—C19 | −177.7 (2) |
C6—C7—C8—C9 | −0.4 (4) | C17—C18—C21—C22 | −153.4 (2) |
C7—C8—C9—C10 | 0.9 (4) | C19—C18—C21—C22 | 29.5 (3) |
C8—C9—C10—C11 | −1.0 (4) | C17—C18—C21—C23 | 82.0 (3) |
C9—C10—C11—C6 | 0.5 (4) | C19—C18—C21—C23 | −95.1 (3) |
C7—C6—C11—C10 | 0.0 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
N7—H7···N3 | 0.97 (2) | 1.84 (2) | 2.682 (3) | 144 (2) |
C8—H8···O1 | 0.95 | 2.32 | 2.954 (3) | 124 |
C18H15N3O4S | Dx = 1.480 Mg m−3 |
Mr = 369.39 | Synchrotron radiation, λ = 0.96990 Å |
Orthorhombic, Pca21 | Cell parameters from 600 reflections |
a = 23.840 (5) Å | θ = 3.7–37.0° |
b = 9.7401 (19) Å | µ = 0.52 mm−1 |
c = 7.1403 (14) Å | T = 100 K |
V = 1658.0 (6) Å3 | Needle, colourless |
Z = 4 | 0.20 × 0.05 × 0.03 mm |
F(000) = 768 |
MAR CCD diffractometer | 3127 reflections with I > 2σ(I) |
phi scan | Rint = 0.073 |
Absorption correction: multi-scan (SCALA; Evans, 2006) | θmax = 38.5°, θmin = 3.7° |
Tmin = 0.890, Tmax = 0.980 | h = −29→29 |
13537 measured reflections | k = −12→12 |
3464 independent reflections | l = −9→8 |
Refinement on F2 | Hydrogen site location: mixed |
Least-squares matrix: full | H atoms treated by a mixture of independent and constrained refinement |
R[F2 > 2σ(F2)] = 0.037 | w = 1/[σ2(Fo2) + (0.0408P)2] where P = (Fo2 + 2Fc2)/3 |
wR(F2) = 0.090 | (Δ/σ)max < 0.001 |
S = 1.05 | Δρmax = 0.25 e Å−3 |
3464 reflections | Δρmin = −0.33 e Å−3 |
240 parameters | Extinction correction: SHELXL2014 (Sheldrick, 2015), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
1 restraint | Extinction coefficient: 0.010 (2) |
Primary atom site location: difference Fourier map | Absolute structure: Flack x determined using 1290 quotients [(I+)-(I-)]/[(I+)+(I-)] (Parsons et al., 2013) |
Secondary atom site location: difference Fourier map | Absolute structure parameter: 0.39 (2) |
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. |
x | y | z | Uiso*/Ueq | ||
S1 | 0.82320 (2) | 0.08743 (5) | 0.40138 (11) | 0.01687 (18) | |
O1 | 0.78056 (7) | 0.74689 (17) | 0.7251 (3) | 0.0221 (5) | |
O2 | 0.69969 (7) | 0.63003 (18) | 0.6617 (3) | 0.0183 (4) | |
O3 | 0.47989 (8) | −0.0296 (2) | 0.3607 (4) | 0.0367 (6) | |
O4 | 0.55366 (8) | −0.14517 (18) | 0.2763 (3) | 0.0279 (5) | |
C2 | 0.80673 (11) | 0.2564 (2) | 0.4636 (4) | 0.0148 (5) | |
N3 | 0.75204 (10) | 0.27926 (18) | 0.4676 (3) | 0.0155 (5) | |
C4 | 0.72122 (10) | 0.1639 (2) | 0.4202 (4) | 0.0152 (5) | |
C5 | 0.75302 (11) | 0.0509 (2) | 0.3800 (4) | 0.0172 (5) | |
H5 | 0.7383 | −0.0360 | 0.3449 | 0.021* | |
C6 | 0.85019 (10) | 0.3582 (2) | 0.5131 (4) | 0.0160 (5) | |
C7 | 0.83664 (11) | 0.4896 (2) | 0.5898 (4) | 0.0148 (6) | |
N7 | 0.77977 (9) | 0.5244 (2) | 0.6077 (3) | 0.0163 (5) | |
H7 | 0.7579 (13) | 0.467 (3) | 0.575 (5) | 0.020* | |
C8 | 0.88015 (12) | 0.5776 (2) | 0.6456 (4) | 0.0180 (6) | |
H8 | 0.8715 | 0.6643 | 0.6992 | 0.022* | |
C9 | 0.93587 (11) | 0.5388 (3) | 0.6230 (4) | 0.0192 (6) | |
H9 | 0.9649 | 0.5992 | 0.6622 | 0.023* | |
C10 | 0.94981 (12) | 0.4124 (2) | 0.5438 (4) | 0.0196 (6) | |
H10 | 0.9880 | 0.3873 | 0.5269 | 0.024* | |
C11 | 0.90696 (11) | 0.3236 (2) | 0.4899 (4) | 0.0179 (6) | |
H11 | 0.9164 | 0.2375 | 0.4360 | 0.021* | |
C12 | 0.75647 (11) | 0.6442 (2) | 0.6700 (4) | 0.0155 (5) | |
C13 | 0.66740 (11) | 0.7511 (3) | 0.7127 (4) | 0.0202 (6) | |
H13A | 0.6795 | 0.8311 | 0.6371 | 0.024* | |
H13B | 0.6729 | 0.7731 | 0.8468 | 0.024* | |
C14 | 0.60652 (11) | 0.7183 (3) | 0.6745 (4) | 0.0240 (6) | |
H14A | 0.6015 | 0.6987 | 0.5409 | 0.036* | |
H14B | 0.5832 | 0.7971 | 0.7096 | 0.036* | |
H14C | 0.5953 | 0.6380 | 0.7482 | 0.036* | |
C15 | 0.65919 (10) | 0.1740 (2) | 0.4257 (4) | 0.0157 (5) | |
C16 | 0.62493 (11) | 0.0627 (2) | 0.3740 (4) | 0.0168 (6) | |
H16 | 0.6410 | −0.0208 | 0.3311 | 0.020* | |
C17 | 0.56702 (10) | 0.0777 (2) | 0.3873 (4) | 0.0173 (6) | |
N17 | 0.53118 (10) | −0.0404 (2) | 0.3375 (4) | 0.0216 (5) | |
C18 | 0.54099 (11) | 0.1977 (3) | 0.4468 (4) | 0.0198 (6) | |
H18 | 0.5013 | 0.2042 | 0.4547 | 0.024* | |
C19 | 0.57550 (11) | 0.3088 (2) | 0.4949 (4) | 0.0188 (6) | |
H19 | 0.5591 | 0.3927 | 0.5351 | 0.023* | |
C20 | 0.63338 (11) | 0.2970 (2) | 0.4843 (4) | 0.0179 (6) | |
H20 | 0.6561 | 0.3734 | 0.5173 | 0.021* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0182 (3) | 0.0103 (3) | 0.0221 (4) | 0.0010 (2) | −0.0001 (3) | −0.0034 (3) |
O1 | 0.0226 (10) | 0.0118 (9) | 0.0320 (13) | −0.0024 (7) | −0.0008 (8) | −0.0069 (8) |
O2 | 0.0139 (10) | 0.0151 (9) | 0.0260 (11) | 0.0009 (7) | 0.0029 (8) | −0.0035 (8) |
O3 | 0.0206 (11) | 0.0298 (11) | 0.0596 (19) | −0.0090 (8) | 0.0045 (11) | −0.0107 (11) |
O4 | 0.0282 (11) | 0.0123 (9) | 0.0432 (14) | 0.0024 (8) | −0.0086 (10) | −0.0063 (9) |
C2 | 0.0186 (13) | 0.0127 (11) | 0.0131 (14) | 0.0002 (10) | −0.0006 (9) | 0.0000 (10) |
N3 | 0.0187 (11) | 0.0117 (9) | 0.0160 (13) | −0.0007 (8) | 0.0000 (9) | −0.0010 (8) |
C4 | 0.0213 (12) | 0.0104 (11) | 0.0138 (14) | −0.0023 (9) | −0.0019 (11) | 0.0003 (10) |
C5 | 0.0206 (12) | 0.0128 (10) | 0.0181 (15) | −0.0025 (10) | −0.0009 (12) | −0.0018 (11) |
C6 | 0.0199 (14) | 0.0119 (12) | 0.0161 (15) | 0.0011 (10) | −0.0007 (11) | 0.0014 (10) |
C7 | 0.0152 (12) | 0.0128 (12) | 0.0165 (16) | 0.0012 (9) | 0.0014 (10) | 0.0017 (10) |
N7 | 0.0148 (11) | 0.0094 (10) | 0.0248 (14) | −0.0014 (8) | 0.0019 (9) | −0.0050 (9) |
C8 | 0.0219 (14) | 0.0105 (12) | 0.0215 (16) | −0.0008 (9) | −0.0019 (11) | −0.0002 (11) |
C9 | 0.0185 (13) | 0.0152 (12) | 0.0240 (16) | −0.0027 (10) | −0.0013 (11) | 0.0032 (11) |
C10 | 0.0182 (14) | 0.0176 (14) | 0.0231 (16) | 0.0003 (9) | 0.0001 (11) | 0.0009 (11) |
C11 | 0.0210 (13) | 0.0133 (12) | 0.0194 (15) | 0.0027 (9) | 0.0010 (11) | −0.0001 (10) |
C12 | 0.0184 (13) | 0.0104 (11) | 0.0177 (14) | 0.0003 (10) | 0.0004 (11) | 0.0026 (10) |
C13 | 0.0188 (13) | 0.0136 (13) | 0.0282 (17) | 0.0063 (10) | 0.0021 (12) | −0.0010 (12) |
C14 | 0.0187 (13) | 0.0273 (15) | 0.0259 (18) | 0.0029 (11) | 0.0015 (11) | −0.0001 (12) |
C15 | 0.0207 (13) | 0.0110 (11) | 0.0153 (14) | −0.0008 (9) | −0.0010 (11) | 0.0029 (10) |
C16 | 0.0212 (13) | 0.0121 (11) | 0.0170 (16) | 0.0004 (9) | −0.0013 (11) | 0.0008 (10) |
C17 | 0.0200 (12) | 0.0120 (11) | 0.0200 (16) | −0.0050 (9) | −0.0009 (13) | 0.0011 (11) |
N17 | 0.0222 (12) | 0.0145 (10) | 0.0282 (15) | −0.0028 (9) | −0.0037 (10) | 0.0005 (10) |
C18 | 0.0199 (13) | 0.0179 (13) | 0.0215 (17) | −0.0013 (10) | −0.0011 (11) | 0.0010 (11) |
C19 | 0.0208 (13) | 0.0115 (12) | 0.0243 (15) | 0.0006 (10) | 0.0012 (11) | −0.0019 (11) |
C20 | 0.0211 (13) | 0.0133 (12) | 0.0192 (14) | −0.0010 (10) | −0.0006 (11) | −0.0009 (10) |
S1—C5 | 1.717 (3) | C9—H9 | 0.9500 |
S1—C2 | 1.750 (2) | C10—C11 | 1.393 (4) |
O1—C12 | 1.218 (3) | C10—H10 | 0.9500 |
O2—C12 | 1.362 (3) | C11—H11 | 0.9500 |
O2—C13 | 1.455 (3) | C13—C14 | 1.511 (4) |
O3—N17 | 1.239 (3) | C13—H13A | 0.9900 |
O4—N17 | 1.233 (3) | C13—H13B | 0.9900 |
C2—N3 | 1.323 (3) | C14—H14A | 0.9800 |
C2—C6 | 1.477 (3) | C14—H14B | 0.9800 |
N3—C4 | 1.385 (3) | C14—H14C | 0.9800 |
C4—C5 | 1.367 (3) | C15—C16 | 1.406 (3) |
C4—C15 | 1.482 (3) | C15—C20 | 1.411 (3) |
C5—H5 | 0.9500 | C16—C17 | 1.391 (3) |
C6—C11 | 1.405 (3) | C16—H16 | 0.9500 |
C6—C7 | 1.429 (3) | C17—C18 | 1.390 (3) |
C7—N7 | 1.404 (3) | C17—N17 | 1.477 (3) |
C7—C8 | 1.403 (4) | C18—C19 | 1.402 (4) |
N7—C12 | 1.367 (3) | C18—H18 | 0.9500 |
N7—H7 | 0.80 (3) | C19—C20 | 1.387 (4) |
C8—C9 | 1.391 (4) | C19—H19 | 0.9500 |
C8—H8 | 0.9500 | C20—H20 | 0.9500 |
C9—C10 | 1.395 (4) | ||
C5—S1—C2 | 89.94 (12) | O2—C12—N7 | 107.6 (2) |
C12—O2—C13 | 115.65 (18) | O2—C13—C14 | 107.0 (2) |
N3—C2—C6 | 125.0 (2) | O2—C13—H13A | 110.3 |
N3—C2—S1 | 112.64 (17) | C14—C13—H13A | 110.3 |
C6—C2—S1 | 122.34 (19) | O2—C13—H13B | 110.3 |
C2—N3—C4 | 112.41 (19) | C14—C13—H13B | 110.3 |
C5—C4—N3 | 114.2 (2) | H13A—C13—H13B | 108.6 |
C5—C4—C15 | 127.8 (2) | C13—C14—H14A | 109.5 |
N3—C4—C15 | 118.0 (2) | C13—C14—H14B | 109.5 |
C4—C5—S1 | 110.78 (18) | H14A—C14—H14B | 109.5 |
C4—C5—H5 | 124.6 | C13—C14—H14C | 109.5 |
S1—C5—H5 | 124.6 | H14A—C14—H14C | 109.5 |
C11—C6—C7 | 118.6 (2) | H14B—C14—H14C | 109.5 |
C11—C6—C2 | 119.1 (2) | C16—C15—C20 | 118.6 (2) |
C7—C6—C2 | 122.3 (2) | C16—C15—C4 | 121.4 (2) |
N7—C7—C8 | 122.7 (2) | C20—C15—C4 | 120.0 (2) |
N7—C7—C6 | 118.0 (2) | C17—C16—C15 | 118.5 (2) |
C8—C7—C6 | 119.3 (2) | C17—C16—H16 | 120.7 |
C12—N7—C7 | 128.9 (2) | C15—C16—H16 | 120.7 |
C12—N7—H7 | 116 (2) | C18—C17—C16 | 123.5 (2) |
C7—N7—H7 | 116 (2) | C18—C17—N17 | 118.1 (2) |
C9—C8—C7 | 120.5 (2) | C16—C17—N17 | 118.4 (2) |
C9—C8—H8 | 119.8 | O4—N17—O3 | 123.2 (2) |
C7—C8—H8 | 119.8 | O4—N17—C17 | 118.6 (2) |
C8—C9—C10 | 121.0 (2) | O3—N17—C17 | 118.2 (2) |
C8—C9—H9 | 119.5 | C17—C18—C19 | 117.5 (2) |
C10—C9—H9 | 119.5 | C17—C18—H18 | 121.3 |
C11—C10—C9 | 119.0 (2) | C19—C18—H18 | 121.3 |
C11—C10—H10 | 120.5 | C20—C19—C18 | 120.5 (2) |
C9—C10—H10 | 120.5 | C20—C19—H19 | 119.8 |
C10—C11—C6 | 121.7 (2) | C18—C19—H19 | 119.8 |
C10—C11—H11 | 119.2 | C19—C20—C15 | 121.4 (2) |
C6—C11—H11 | 119.2 | C19—C20—H20 | 119.3 |
O1—C12—O2 | 124.5 (2) | C15—C20—H20 | 119.3 |
O1—C12—N7 | 127.9 (2) | ||
C5—S1—C2—N3 | 0.4 (2) | C2—C6—C11—C10 | −176.4 (3) |
C5—S1—C2—C6 | 178.0 (2) | C13—O2—C12—O1 | 3.8 (4) |
C6—C2—N3—C4 | −178.0 (2) | C13—O2—C12—N7 | −176.5 (2) |
S1—C2—N3—C4 | −0.4 (3) | C7—N7—C12—O1 | −0.6 (5) |
C2—N3—C4—C5 | 0.2 (3) | C7—N7—C12—O2 | 179.8 (2) |
C2—N3—C4—C15 | 177.9 (2) | C12—O2—C13—C14 | 174.2 (2) |
N3—C4—C5—S1 | 0.1 (3) | C5—C4—C15—C16 | −4.7 (5) |
C15—C4—C5—S1 | −177.3 (2) | N3—C4—C15—C16 | 178.0 (3) |
C2—S1—C5—C4 | −0.3 (2) | C5—C4—C15—C20 | 175.1 (3) |
N3—C2—C6—C11 | −175.5 (2) | N3—C4—C15—C20 | −2.2 (4) |
S1—C2—C6—C11 | 7.2 (4) | C20—C15—C16—C17 | −1.5 (4) |
N3—C2—C6—C7 | 6.7 (4) | C4—C15—C16—C17 | 178.3 (3) |
S1—C2—C6—C7 | −170.7 (2) | C15—C16—C17—C18 | 0.8 (4) |
C11—C6—C7—N7 | 178.4 (2) | C15—C16—C17—N17 | −178.5 (3) |
C2—C6—C7—N7 | −3.7 (4) | C18—C17—N17—O4 | 176.7 (3) |
C11—C6—C7—C8 | −2.3 (4) | C16—C17—N17—O4 | −3.9 (4) |
C2—C6—C7—C8 | 175.6 (2) | C18—C17—N17—O3 | −3.9 (4) |
C8—C7—N7—C12 | 3.2 (5) | C16—C17—N17—O3 | 175.5 (3) |
C6—C7—N7—C12 | −177.5 (3) | C16—C17—C18—C19 | 0.3 (4) |
N7—C7—C8—C9 | −179.3 (3) | N17—C17—C18—C19 | 179.6 (2) |
C6—C7—C8—C9 | 1.3 (4) | C17—C18—C19—C20 | −0.6 (4) |
C7—C8—C9—C10 | 0.4 (4) | C18—C19—C20—C15 | −0.1 (4) |
C8—C9—C10—C11 | −1.1 (4) | C16—C15—C20—C19 | 1.2 (4) |
C9—C10—C11—C6 | 0.1 (4) | C4—C15—C20—C19 | −178.6 (2) |
C7—C6—C11—C10 | 1.6 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
C5—H5···O1i | 0.95 | 2.32 | 3.260 (3) | 168 |
N7—H7···N3 | 0.80 (3) | 1.98 (3) | 2.672 (3) | 144 (3) |
C8—H8···O1 | 0.95 | 2.32 | 2.946 (3) | 123 |
Symmetry code: (i) −x+3/2, y−1, z−1/2. |
Acknowledgements
The authors are grateful to the Ministry of Education and Science of the Russian Federation (State program No. 426).
References
AaminaNaaz, Y., Sathiyaraj, S., Kalaimani, S., Nasar, A. S. & SubbiahPandi, A. (2015). Acta Cryst. E71, o969–o970. CSD CrossRef IUCr Journals Google Scholar
Battye, T. G. G., Kontogiannis, L., Johnson, O., Powell, H. R. & Leslie, A. G. W. (2011). Acta Cryst. D67, 271–281. Web of Science CrossRef CAS IUCr Journals Google Scholar
Bérdy, J. (2005). J. Antibiot. 58, 1–26. PubMed Google Scholar
Bister, B., Bischoff, D., Ströbele, M., Riedlinger, J., Reicke, A., Wolter, F., Bull, A. T., Zähner, H., Fiedler, H. P. & Süssmuth, R. D. (2004). Angew. Chem. Int. Ed. 43, 2574–2576. CSD CrossRef CAS Google Scholar
Bull, A. T. & Stach, J. E. (2007). Trends Microbiol. 15, 491–499. CrossRef PubMed CAS Google Scholar
Bunev, A. S., Rudakova, Y. I., Statsyuk, V. E., Ostapenko, G. I. & Khrustalev, V. N. (2014). Acta Cryst. E70, o139. CSD CrossRef IUCr Journals Google Scholar
Carroll, A. R., Coll, J. C., Bourne, D. L., MacLeod, J. K., Ireland, C. M. & Bowden, B. F. (1996). Aust. J. Chem. 49, 659–667. CAS Google Scholar
Charan, R. D., Schlingmann, G., Janso, J., Bernan, V., Feng, X. & Carter, G. T. (2004). J. Nat. Prod. 67, 1431–1433. CrossRef PubMed CAS Google Scholar
Evans, P. (2006). Acta Cryst. D62, 72–82. Web of Science CrossRef CAS IUCr Journals Google Scholar
Feling, R. H., Buchanan, G. O., Mincer, T. J., Kauffman, C. A., Jensen, P. R. & Fenical, W. (2003). Angew. Chem. Int. Ed. 42, 355–357. CSD CrossRef CAS Google Scholar
Fenical, W. & Jensen, P. R. (2006). Nat. Chem. Biol. 2, 666–673. CrossRef PubMed CAS Google Scholar
Fu, P. & MacMillan, J. B. (2015). J. Nat. Prod. 78, 548–551. CrossRef CAS PubMed Google Scholar
Fu, P., Wang, S., Hong, K., Li, X., Liu, P., Wang, Y. & Zhu, W. (2011). J. Nat. Prod. 74, 1751–1756. CrossRef CAS PubMed Google Scholar
Garden, S. J., Corrêa, M. B., Pinto, A. C., Wardell, J. L., Low, J. N. & Glidewell, C. (2007). Acta Cryst. C63, o234–o238. Web of Science CSD CrossRef IUCr Journals Google Scholar
Hua, G., Du, J., Slawin, A. M. Z. & Woollins, J. D. (2014). J. Org. Chem. 79, 3876–3886. CSD CrossRef CAS PubMed Google Scholar
Kwon, H. C., Kauffman, C. A., Jensen, P. R. & Fenical, W. (2006). J. Am. Chem. Soc. 128, 1622–1632. CrossRef PubMed CAS Google Scholar
Lam, K. S. (2006). Curr. Opin. Microbiol. 9, 245–251. CrossRef PubMed CAS Google Scholar
Luesch, H., Yoshida, W. Y., Moore, R. E., Paul, V. J. & Corbett, T. H. (2001). J. Am. Chem. Soc. 123, 5418–5423. CrossRef PubMed CAS Google Scholar
Mague, J. T., Mohamed, S. K., Akkurt, M., Hassan, A. A. & Albayati, M. R. (2014). Acta Cryst. E70, o907–o908. CSD CrossRef IUCr Journals Google Scholar
MarXperts. (2015). Automar. MarXperts GmbH, D-22844 Norderstedt, Germany. Google Scholar
Molinski, T. F., Dalisay, D. S., Lievens, S. L. & Saludes, J. P. (2009). Nat. Rev. Drug Discov. 8, 69–85. CrossRef PubMed CAS Google Scholar
Moreno-Fuquen, R., Castillo, J. C., Becerra, D., Camargo, H. & Henao, J. A. (2015). Acta Cryst. E71, o882–o883. CSD CrossRef IUCr Journals Google Scholar
Nayak, S. K., Venugopala, K. N., Chopra, D., Govender, T., Kruger, H. G., Maguire, G. E. M. & Guru Row, T. N. (2009). Acta Cryst. E65, o2611–o2612. CSD CrossRef IUCr Journals Google Scholar
Parsons, S., Flack, H. D. & Wagner, T. (2013). Acta Cryst. B69, 249–259. Web of Science CrossRef CAS IUCr Journals Google Scholar
Şen, F., Dinçer, M., Çukurovalı, A., Yılmaz, İ. (2013). J. Mol. Struct. 1046, 1–8. Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Sheldrick, G. M. (2015). Acta Cryst. C71, 3–8. Web of Science CrossRef IUCr Journals Google Scholar
Shimanaka, K., Kinoshita, N., Iinuma, H., Hamada, M. & Takeuchi, T. (1994). J. Antibiot. 47, 668–674. CrossRef CAS PubMed Google Scholar
Taori, K., Paul, V. J. & Luesch, H. (2008). J. Am. Chem. Soc. 130, 1806–1807. CrossRef PubMed CAS Google Scholar
Yun, B. S., Hidaka, T., Furihata, K. & Seto, H. (1994). J. Antibiot. 47, 510–514. CrossRef CAS PubMed Google Scholar
Zabriskie, T. M., Foster, M. P., Stout, T. Y., Clardy, J. & Ireland, C. M. (1990). J. Am. Chem. Soc. 112, 8080–8084. CSD CrossRef CAS Google Scholar
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