research communications
Crystal structures of (E)-4-[1-(2-carbamothioylhydrazinylidene)ethyl]phenyl acetate and (E)-4-[1-(2-carbamothioylhydrazinylidene)ethyl]phenyl benzoate
aCentre of Advanced Study in Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai 600 025, India, and bDepartment of Chemistry, Asthagiri Herbal Research Foundation, Perungudi Industrial Estate, Perungudi, Chennai 600 096, India
*Correspondence e-mail: shirai2011@gmail.com
In the title compounds, C11H13N3O2S, (I), and C16H15N3O2S, (II), the thiosemicarbazone group adopts an extended conformation. The acetate ester (I) crystallizes with two independent molecules in the In the benzoate ester (II), the planes of the two aryl rings are inclined to one another by 46.70 (7)°. In both compounds, there is a short intramolecular N—H⋯N contact present, forming an S(5) ring motif. In the crystals of both compounds, molecules are linked via pairs of N—H⋯S hydrogen bonds, forming dimers with R22(8) ring motifs. The dimers are linked by N—H⋯S and N—H⋯O hydrogen bonds, forming slabs parallel to (01-1). In (I), there are N—H⋯π and C—H⋯π interactions present within the slabs, while in (II), there are only N—H⋯π interactions present.
1. Chemical context
Thiosemicarbazones are potent intermediates for the synthesis of pharmaceutical and bioactive materials and they are used extensively in the field of medicinal chemistry. The biological activity of these ligands is related to their ability to coordinate to metal centres in enzymes (Seena et al., 2006). These derivatives possess an additional that is not coordinated to their `primary' metal ion, thereby suggesting that the biological activity may also depend on the non-coordinating groups (Venkatesh et al., 2016). Thiosemicarbazones in their neutral or deprotonated form behave as N,N,S-thiodentate chelates towards metal ions. They display antiproliferative activity on different tumors cell lines and have been a common feature of all compounds with carcinogenic potency. A strong correlation has been found between tumor growth rate and the ribonucleoside diphosphate reductase (RDR) enzyme (Arora et al., 2014).
Thiosemicarbazone derivatives have found applications in drug development for the treatment of central nervous system disorders and bacterial infection as well as being analgesic and anti-allergic agents. They are inhibitors of DNA replication and also of many et al., 2015). Thiosemicarbazones have many biological activities such as antiviral, antibacterial, antitumor, anti African trypanosome (Fatondji et al., 2013), antimicrobial, sodium channel blocker, anticancer, antitubercular, antiviral (Venkatesh et al., 2016), antifungal, locomotor activity (Singh et al., 2011), antimalarial, anticancer and they are used as a cure for leprosy, rheumatism and trypanosomiasis (Parul et al., 2012). As part of our studies in this area, we now describe the syntheses and structures of the title compounds (I) and (II).
This inhibitory activity explains the level of interest given to them in the fight against microbial and parasitic diseases (Mani2. Structural commentary
The molecular structure of compounds (I) and (II) are shown in Figs. 1 and 2, respectively. Compound (I) crystallizes with two independent molecules in the In both the compounds, there is a short N—H⋯N contact, forming an S(5) ring motif (Figs. 1 and 2, and Tables 1 and 2). In both compounds, the thiosemicarbazone group adopts an extended conformation, as can be seen from the torsion angle S1—C11—N2—N1 [−173.1 (1)° in molecule A and −174.9 (1)° in molecule B of compound (I)] and S1—C16—N2—N1 [172.2 (1)° in compound (II)]. In compound (I), the acetate group adopts an extended conformation, which is evidenced by the torsion angle C1—C2—O2—C3 [−173.2 (2) and 179.9 (2)° in molecules A and B, respectively]. The bond lengths C11A—S1A [1.692 (2) Å] and C11B—S1B [1.680 (2) Å] in (I) and C16—S1 [1.679 (1) Å] in (II) are comparable with the values reported in the literature (CSD; Groom et al., 2016). In compound (II), the benzoate and acetophenone thiosemicarbozone groups lie in a plane [C6—C7—O2—C8 = 175.9 (1)°]. The carbonyl group is oriented syn-periplanar to C5 [C5—C6—C7—O1 = −15.8 (2) °] and anti-periplanar to C1 [C1—C6—C7—O1 = 160.7 (1) °]. The dihedral angle between the benzene rings in compound (II) is 46.70 (7)°.
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3. Supramolecular features
In the crystal of (I), the two molecules are linked by a pair of N—H⋯S hydrogen bonds forming A–B dimers with an (8) ring motif. The dimers are linked by N—H⋯S and N—H⋯O hydrogen bonds, forming slabs lying parallel to (01), as shown in Table 1 and Fig. 3. Within the slabs there are N—H⋯π and C—H⋯π interactions present (Table 1).
In the crystal of (II), molecules are linked by pairs of N—H⋯S hydrogen bonds, forming inversion dimers with an (8) ring motif (Table 2 and Fig. 4). As in the crystal of compound (I), the dimers are linked by N—H⋯S and N—H⋯O hydrogen bonds, forming slabs lying parallel to plane (01); see Table 2 and Fig. 4. Within the slabs, there are only N—H⋯π interactions present (Table 2).
4. Database survey
A search of the Cambridge Structural Database (CSD, Version 5.37, last update May 2016; Groom et al., 2016) for the 2-(1-phenylethylidene)hydrazine-1-carbothioamide yielded 100 hits. One of the compounds, (E)-4-(N-carbamothioylethanehydrazonoyl)phenyl 4-methylbenzoate (NOVFOV; Mani et al., 2015) is the 4-methylbenzoate analogue of compound (II). Like compound (I), it crystallizes with two independent molecules in the The two molecules differ essentially in the orientation of the hydrazinecarbothioamide unit with respect to the central benzene ring. This dihedral angle is 5.95 (8)° in the first molecule and 42.56 (9)° in the second. The benzoate groups are relatively planar and are inclined to the central benzene ring by 72.23 (7) and 53.10 (9)°, respectively, in the first and second molecules. Hence, the conformation of the second molecule resembles that of compound (II).
5. Synthesis and crystallization
Compounds (I) and (II): Thiosemicarbazide (0.91g, 0.01 mol) was added to 50 ml of an ethanolic solution of the 4-acetyl phenyl acetate (0.01 mol) for (I), and to an ethanolic solution of the 4-acetylphenyl benzoate (0.01 mol) for (II), with continuous stirring for 4–5 h. The resulting mixtures were refluxed at 333 K and the purity of the products as well as composition of the reaction mixtures was monitored by TLC using ethyl acetate: hexane (3:7). The reaction mixtures were cooled to room temperature and the separated products were filtered, dried and finally recrystallized from chloroform, solution, yielding block-like yellow crystals of (I) and pale-yellow crystals of (II).
6. Refinement
Crystal data, data collection and structure . Hydrogen atoms were placed in calculated positions and refined as riding atoms: C—H = 0.93–0.96 Å and N—H = 0.86 Å, with Uiso(H) = 1.5Ueq(C-methyl) and 1.2Ueq(C,N) for other H atoms.
details are summarized in Table 3
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Supporting information
https://doi.org/10.1107/S2056989016018983/su5323sup1.cif
contains datablocks global, I, II. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989016018983/su5323Isup2.hkl
Structure factors: contains datablock II. DOI: https://doi.org/10.1107/S2056989016018983/su5323IIsup3.hkl
For both compounds, data collection: APEX2 (Bruker, 2008); cell
SAINT (Bruker, 2008); data reduction: SAINT (Bruker, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and Mercury (Macrae et al., 2008). Software used to prepare material for publication: SHELXL2014 (Sheldrick, 2015) and PLATON (Spek, 2009) for (I); SHELXL2014 (Sheldrick, 2008) and PLATON (Spek, 2009) for (II).C11H13N3O2S | Z = 4 |
Mr = 251.30 | F(000) = 528 |
Triclinic, P1 | Dx = 1.330 Mg m−3 |
a = 7.8783 (2) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 8.9254 (3) Å | Cell parameters from 5128 reflections |
c = 18.7372 (5) Å | θ = 1.1–26.4° |
α = 77.243 (2)° | µ = 0.25 mm−1 |
β = 82.423 (2)° | T = 293 K |
γ = 78.856 (2)° | Block, yellow |
V = 1255.30 (6) Å3 | 0.20 × 0.15 × 0.10 mm |
Bruker SMART APEXII area-detector diffractometer | 4104 reflections with I > 2σ(I) |
ω and φ scans | Rint = 0.023 |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | θmax = 26.4°, θmin = 1.1° |
Tmin = 0.785, Tmax = 0.854 | h = −9→9 |
18970 measured reflections | k = −11→11 |
5128 independent reflections | l = −23→23 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.038 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.109 | H-atom parameters constrained |
S = 1.03 | w = 1/[σ2(Fo2) + (0.0498P)2 + 0.3822P] where P = (Fo2 + 2Fc2)/3 |
5128 reflections | (Δ/σ)max = 0.001 |
311 parameters | Δρmax = 0.25 e Å−3 |
0 restraints | Δρmin = −0.31 e Å−3 |
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 | ||
C10B | 0.2271 (3) | 0.1728 (3) | 0.52308 (11) | 0.0616 (5) | |
H10A | 0.1335 | 0.2449 | 0.5001 | 0.092* | |
H10B | 0.2263 | 0.1858 | 0.5726 | 0.092* | |
H10C | 0.2129 | 0.0681 | 0.5235 | 0.092* | |
C1A | 0.0183 (3) | 0.8835 (3) | 1.22191 (11) | 0.0706 (6) | |
H1A1 | 0.0436 | 0.9807 | 1.2279 | 0.106* | |
H1A2 | 0.0630 | 0.8015 | 1.2607 | 0.106* | |
H1A3 | −0.1051 | 0.8899 | 1.2236 | 0.106* | |
C1B | 0.5549 (3) | 0.0841 (3) | 0.07427 (10) | 0.0632 (5) | |
H1B1 | 0.4721 | 0.1283 | 0.0388 | 0.095* | |
H1B2 | 0.5685 | −0.0275 | 0.0835 | 0.095* | |
H1B3 | 0.6646 | 0.1158 | 0.0556 | 0.095* | |
C2A | 0.1010 (3) | 0.8500 (2) | 1.15003 (10) | 0.0506 (4) | |
C2B | 0.4920 (3) | 0.1395 (2) | 0.14379 (9) | 0.0515 (4) | |
C3A | 0.0618 (2) | 0.7263 (2) | 1.05471 (9) | 0.0438 (4) | |
C3B | 0.5256 (3) | 0.0862 (2) | 0.27010 (9) | 0.0501 (4) | |
C4A | −0.0202 (2) | 0.7922 (2) | 0.99205 (10) | 0.0497 (4) | |
H4A | −0.1086 | 0.8781 | 0.9916 | 0.060* | |
C4B | 0.6282 (3) | 0.1679 (2) | 0.29458 (10) | 0.0564 (5) | |
H4B | 0.7253 | 0.1982 | 0.2652 | 0.068* | |
C5A | 0.0297 (2) | 0.7298 (2) | 0.92993 (9) | 0.0476 (4) | |
H5A | −0.0266 | 0.7738 | 0.8877 | 0.057* | |
C5B | 0.5867 (3) | 0.2050 (2) | 0.36322 (9) | 0.0533 (5) | |
H5B | 0.6566 | 0.2603 | 0.3800 | 0.064* | |
C6A | 0.1629 (2) | 0.60209 (19) | 0.92929 (8) | 0.0396 (4) | |
C6B | 0.4412 (2) | 0.16043 (19) | 0.40777 (9) | 0.0438 (4) | |
C7A | 0.2445 (2) | 0.5402 (2) | 0.99344 (9) | 0.0459 (4) | |
H7A | 0.3351 | 0.4559 | 0.9942 | 0.055* | |
C7B | 0.3427 (3) | 0.0750 (2) | 0.38147 (10) | 0.0548 (5) | |
H7B | 0.2464 | 0.0423 | 0.4106 | 0.066* | |
C8A | 0.1934 (2) | 0.6015 (2) | 1.05617 (9) | 0.0481 (4) | |
H8A | 0.2482 | 0.5581 | 1.0988 | 0.058* | |
C8B | 0.3850 (3) | 0.0372 (2) | 0.31264 (10) | 0.0588 (5) | |
H8B | 0.3182 | −0.0207 | 0.2958 | 0.071* | |
C9A | 0.2116 (2) | 0.5324 (2) | 0.86296 (8) | 0.0412 (4) | |
C9B | 0.3961 (2) | 0.20310 (19) | 0.48111 (9) | 0.0427 (4) | |
C10A | 0.3766 (3) | 0.4199 (3) | 0.85640 (11) | 0.0705 (6) | |
H10D | 0.4646 | 0.4736 | 0.8273 | 0.106* | |
H10E | 0.3581 | 0.3395 | 0.8332 | 0.106* | |
H10F | 0.4132 | 0.3743 | 0.9045 | 0.106* | |
C11A | 0.0194 (2) | 0.5408 (2) | 0.70414 (9) | 0.0428 (4) | |
C11B | 0.6013 (2) | 0.3524 (2) | 0.59815 (9) | 0.0448 (4) | |
N1A | 0.10302 (18) | 0.57512 (17) | 0.81405 (7) | 0.0423 (3) | |
N1B | 0.50947 (19) | 0.26330 (17) | 0.50292 (7) | 0.0460 (3) | |
N2A | 0.14402 (18) | 0.52010 (17) | 0.74940 (7) | 0.0444 (3) | |
H2A | 0.2473 | 0.4736 | 0.7384 | 0.053* | |
N2B | 0.47614 (19) | 0.30636 (18) | 0.57038 (7) | 0.0483 (4) | |
H2B | 0.3756 | 0.3037 | 0.5945 | 0.058* | |
N3A | −0.1399 (2) | 0.5972 (2) | 0.72772 (8) | 0.0602 (4) | |
H3A1 | −0.1609 | 0.6193 | 0.7708 | 0.072* | |
H3A2 | −0.2229 | 0.6120 | 0.7001 | 0.072* | |
N3B | 0.7503 (2) | 0.3608 (2) | 0.55723 (9) | 0.0641 (5) | |
H3B1 | 0.7642 | 0.3371 | 0.5145 | 0.077* | |
H3B2 | 0.8335 | 0.3898 | 0.5733 | 0.077* | |
O1A | 0.2381 (2) | 0.8767 (2) | 1.12093 (9) | 0.0800 (5) | |
O1B | 0.3862 (2) | 0.2510 (2) | 0.15026 (8) | 0.0863 (5) | |
O2A | −0.00302 (17) | 0.78178 (16) | 1.11913 (7) | 0.0555 (3) | |
O2B | 0.57246 (19) | 0.04701 (15) | 0.20057 (7) | 0.0607 (4) | |
S1A | 0.07063 (6) | 0.49355 (7) | 0.62043 (2) | 0.05713 (16) | |
S1B | 0.56754 (6) | 0.39051 (7) | 0.68325 (2) | 0.05582 (15) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C10B | 0.0553 (12) | 0.0813 (14) | 0.0553 (11) | −0.0165 (11) | 0.0010 (9) | −0.0283 (10) |
C1A | 0.0818 (15) | 0.0834 (15) | 0.0541 (11) | −0.0020 (12) | −0.0163 (11) | −0.0344 (11) |
C1B | 0.0750 (14) | 0.0799 (14) | 0.0428 (10) | −0.0222 (11) | 0.0034 (9) | −0.0265 (9) |
C2A | 0.0566 (12) | 0.0518 (10) | 0.0477 (10) | −0.0062 (9) | −0.0142 (9) | −0.0161 (8) |
C2B | 0.0558 (11) | 0.0610 (11) | 0.0406 (9) | −0.0078 (10) | −0.0053 (8) | −0.0179 (8) |
C3A | 0.0435 (9) | 0.0564 (10) | 0.0378 (8) | −0.0175 (8) | 0.0009 (7) | −0.0177 (7) |
C3B | 0.0664 (12) | 0.0445 (9) | 0.0384 (9) | 0.0034 (9) | −0.0108 (8) | −0.0140 (7) |
C4A | 0.0490 (10) | 0.0543 (10) | 0.0488 (10) | −0.0039 (8) | −0.0074 (8) | −0.0192 (8) |
C4B | 0.0699 (13) | 0.0590 (11) | 0.0427 (9) | −0.0163 (10) | 0.0035 (9) | −0.0158 (8) |
C5A | 0.0514 (10) | 0.0539 (10) | 0.0396 (9) | −0.0061 (8) | −0.0110 (7) | −0.0126 (7) |
C5B | 0.0665 (12) | 0.0565 (10) | 0.0428 (9) | −0.0181 (9) | −0.0010 (8) | −0.0181 (8) |
C6A | 0.0379 (9) | 0.0493 (9) | 0.0352 (8) | −0.0144 (7) | −0.0021 (6) | −0.0106 (7) |
C6B | 0.0530 (10) | 0.0417 (9) | 0.0364 (8) | −0.0031 (8) | −0.0094 (7) | −0.0086 (7) |
C7A | 0.0440 (10) | 0.0544 (10) | 0.0394 (8) | −0.0043 (8) | −0.0064 (7) | −0.0118 (7) |
C7B | 0.0580 (12) | 0.0644 (11) | 0.0464 (10) | −0.0153 (9) | −0.0054 (8) | −0.0157 (8) |
C8A | 0.0500 (10) | 0.0623 (11) | 0.0340 (8) | −0.0116 (9) | −0.0081 (7) | −0.0095 (7) |
C8B | 0.0694 (13) | 0.0628 (12) | 0.0530 (11) | −0.0124 (10) | −0.0154 (10) | −0.0235 (9) |
C9A | 0.0368 (9) | 0.0536 (10) | 0.0352 (8) | −0.0112 (7) | −0.0013 (7) | −0.0113 (7) |
C9B | 0.0452 (9) | 0.0456 (9) | 0.0365 (8) | −0.0022 (7) | −0.0078 (7) | −0.0093 (7) |
C10A | 0.0578 (13) | 0.1042 (17) | 0.0488 (11) | 0.0159 (12) | −0.0143 (9) | −0.0341 (11) |
C11A | 0.0387 (9) | 0.0554 (10) | 0.0362 (8) | −0.0082 (8) | −0.0039 (7) | −0.0130 (7) |
C11B | 0.0403 (9) | 0.0559 (10) | 0.0388 (8) | −0.0021 (8) | −0.0052 (7) | −0.0153 (7) |
N1A | 0.0410 (8) | 0.0560 (8) | 0.0335 (7) | −0.0104 (6) | −0.0013 (6) | −0.0158 (6) |
N1B | 0.0477 (8) | 0.0579 (9) | 0.0338 (7) | −0.0041 (7) | −0.0047 (6) | −0.0156 (6) |
N2A | 0.0355 (7) | 0.0657 (9) | 0.0349 (7) | −0.0049 (7) | −0.0024 (6) | −0.0202 (6) |
N2B | 0.0397 (8) | 0.0720 (10) | 0.0371 (7) | −0.0072 (7) | −0.0011 (6) | −0.0228 (7) |
N3A | 0.0410 (9) | 0.0971 (13) | 0.0450 (8) | 0.0060 (8) | −0.0084 (7) | −0.0322 (8) |
N3B | 0.0451 (9) | 0.1090 (14) | 0.0489 (9) | −0.0192 (9) | 0.0046 (7) | −0.0384 (9) |
O1A | 0.0727 (11) | 0.1024 (12) | 0.0834 (11) | −0.0401 (10) | 0.0012 (8) | −0.0408 (9) |
O1B | 0.1032 (13) | 0.0907 (11) | 0.0507 (8) | 0.0349 (10) | −0.0177 (8) | −0.0223 (8) |
O2A | 0.0525 (8) | 0.0791 (9) | 0.0448 (7) | −0.0190 (7) | 0.0029 (6) | −0.0311 (6) |
O2B | 0.0776 (9) | 0.0599 (8) | 0.0442 (7) | 0.0098 (7) | −0.0114 (6) | −0.0246 (6) |
S1A | 0.0422 (3) | 0.0971 (4) | 0.0381 (2) | −0.0090 (2) | −0.00201 (18) | −0.0298 (2) |
S1B | 0.0444 (3) | 0.0874 (4) | 0.0418 (2) | −0.0056 (2) | −0.00359 (19) | −0.0310 (2) |
C10B—C9B | 1.494 (3) | C6A—C7A | 1.392 (2) |
C10B—H10A | 0.9600 | C6A—C9A | 1.484 (2) |
C10B—H10B | 0.9600 | C6B—C7B | 1.387 (2) |
C10B—H10C | 0.9600 | C6B—C9B | 1.487 (2) |
C1A—C2A | 1.483 (3) | C7A—C8A | 1.385 (2) |
C1A—H1A1 | 0.9600 | C7A—H7A | 0.9300 |
C1A—H1A2 | 0.9600 | C7B—C8B | 1.387 (2) |
C1A—H1A3 | 0.9600 | C7B—H7B | 0.9300 |
C1B—C2B | 1.485 (2) | C8A—H8A | 0.9300 |
C1B—H1B1 | 0.9600 | C8B—H8B | 0.9300 |
C1B—H1B2 | 0.9600 | C9A—N1A | 1.282 (2) |
C1B—H1B3 | 0.9600 | C9A—C10A | 1.490 (3) |
C2A—O1A | 1.186 (2) | C9B—N1B | 1.278 (2) |
C2A—O2A | 1.361 (2) | C10A—H10D | 0.9600 |
C2B—O1B | 1.186 (2) | C10A—H10E | 0.9600 |
C2B—O2B | 1.343 (2) | C10A—H10F | 0.9600 |
C3A—C8A | 1.366 (3) | C11A—N3A | 1.315 (2) |
C3A—C4A | 1.375 (2) | C11A—N2A | 1.341 (2) |
C3A—O2A | 1.4023 (19) | C11A—S1A | 1.6915 (16) |
C3B—C8B | 1.361 (3) | C11B—N3B | 1.320 (2) |
C3B—C4B | 1.367 (3) | C11B—N2B | 1.341 (2) |
C3B—O2B | 1.4074 (19) | C11B—S1B | 1.6799 (16) |
C4A—C5A | 1.379 (2) | N1A—N2A | 1.3825 (17) |
C4A—H4A | 0.9300 | N1B—N2B | 1.3792 (18) |
C4B—C5B | 1.381 (2) | N2A—H2A | 0.8600 |
C4B—H4B | 0.9300 | N2B—H2B | 0.8600 |
C5A—C6A | 1.394 (2) | N3A—H3A1 | 0.8600 |
C5A—H5A | 0.9300 | N3A—H3A2 | 0.8600 |
C5B—C6B | 1.395 (3) | N3B—H3B1 | 0.8600 |
C5B—H5B | 0.9300 | N3B—H3B2 | 0.8600 |
C9B—C10B—H10A | 109.5 | C5B—C6B—C9B | 120.40 (15) |
C9B—C10B—H10B | 109.5 | C8A—C7A—C6A | 121.27 (17) |
H10A—C10B—H10B | 109.5 | C8A—C7A—H7A | 119.4 |
C9B—C10B—H10C | 109.5 | C6A—C7A—H7A | 119.4 |
H10A—C10B—H10C | 109.5 | C8B—C7B—C6B | 121.33 (18) |
H10B—C10B—H10C | 109.5 | C8B—C7B—H7B | 119.3 |
C2A—C1A—H1A1 | 109.5 | C6B—C7B—H7B | 119.3 |
C2A—C1A—H1A2 | 109.5 | C3A—C8A—C7A | 119.29 (16) |
H1A1—C1A—H1A2 | 109.5 | C3A—C8A—H8A | 120.4 |
C2A—C1A—H1A3 | 109.5 | C7A—C8A—H8A | 120.4 |
H1A1—C1A—H1A3 | 109.5 | C3B—C8B—C7B | 119.06 (17) |
H1A2—C1A—H1A3 | 109.5 | C3B—C8B—H8B | 120.5 |
C2B—C1B—H1B1 | 109.5 | C7B—C8B—H8B | 120.5 |
C2B—C1B—H1B2 | 109.5 | N1A—C9A—C6A | 115.51 (15) |
H1B1—C1B—H1B2 | 109.5 | N1A—C9A—C10A | 124.10 (15) |
C2B—C1B—H1B3 | 109.5 | C6A—C9A—C10A | 120.39 (14) |
H1B1—C1B—H1B3 | 109.5 | N1B—C9B—C6B | 115.48 (15) |
H1B2—C1B—H1B3 | 109.5 | N1B—C9B—C10B | 125.51 (15) |
O1A—C2A—O2A | 122.19 (17) | C6B—C9B—C10B | 119.01 (15) |
O1A—C2A—C1A | 127.08 (18) | C9A—C10A—H10D | 109.5 |
O2A—C2A—C1A | 110.72 (17) | C9A—C10A—H10E | 109.5 |
O1B—C2B—O2B | 122.74 (16) | H10D—C10A—H10E | 109.5 |
O1B—C2B—C1B | 126.04 (18) | C9A—C10A—H10F | 109.5 |
O2B—C2B—C1B | 111.22 (17) | H10D—C10A—H10F | 109.5 |
C8A—C3A—C4A | 121.15 (15) | H10E—C10A—H10F | 109.5 |
C8A—C3A—O2A | 120.42 (15) | N3A—C11A—N2A | 117.60 (14) |
C4A—C3A—O2A | 118.20 (16) | N3A—C11A—S1A | 122.72 (13) |
C8B—C3B—C4B | 121.45 (16) | N2A—C11A—S1A | 119.68 (12) |
C8B—C3B—O2B | 119.99 (17) | N3B—C11B—N2B | 117.47 (15) |
C4B—C3B—O2B | 118.50 (17) | N3B—C11B—S1B | 122.55 (13) |
C3A—C4A—C5A | 119.40 (17) | N2B—C11B—S1B | 119.94 (13) |
C3A—C4A—H4A | 120.3 | C9A—N1A—N2A | 118.53 (14) |
C5A—C4A—H4A | 120.3 | C9B—N1B—N2B | 118.72 (14) |
C3B—C4B—C5B | 119.52 (18) | C11A—N2A—N1A | 118.60 (13) |
C3B—C4B—H4B | 120.2 | C11A—N2A—H2A | 120.7 |
C5B—C4B—H4B | 120.2 | N1A—N2A—H2A | 120.7 |
C4A—C5A—C6A | 121.19 (16) | C11B—N2B—N1B | 119.63 (14) |
C4A—C5A—H5A | 119.4 | C11B—N2B—H2B | 120.2 |
C6A—C5A—H5A | 119.4 | N1B—N2B—H2B | 120.2 |
C4B—C5B—C6B | 120.83 (17) | C11A—N3A—H3A1 | 120.0 |
C4B—C5B—H5B | 119.6 | C11A—N3A—H3A2 | 120.0 |
C6B—C5B—H5B | 119.6 | H3A1—N3A—H3A2 | 120.0 |
C7A—C6A—C5A | 117.68 (15) | C11B—N3B—H3B1 | 120.0 |
C7A—C6A—C9A | 121.51 (15) | C11B—N3B—H3B2 | 120.0 |
C5A—C6A—C9A | 120.79 (14) | H3B1—N3B—H3B2 | 120.0 |
C7B—C6B—C5B | 117.77 (16) | C2A—O2A—C3A | 118.74 (14) |
C7B—C6B—C9B | 121.82 (16) | C2B—O2B—C3B | 117.30 (14) |
C8A—C3A—C4A—C5A | 0.9 (3) | C5A—C6A—C9A—C10A | 166.64 (18) |
O2A—C3A—C4A—C5A | −173.63 (15) | C7B—C6B—C9B—N1B | 170.96 (17) |
C8B—C3B—C4B—C5B | −1.6 (3) | C5B—C6B—C9B—N1B | −8.5 (2) |
O2B—C3B—C4B—C5B | −178.73 (17) | C7B—C6B—C9B—C10B | −8.7 (3) |
C3A—C4A—C5A—C6A | −0.6 (3) | C5B—C6B—C9B—C10B | 171.80 (17) |
C3B—C4B—C5B—C6B | −0.1 (3) | C6A—C9A—N1A—N2A | 177.13 (13) |
C4A—C5A—C6A—C7A | −0.3 (3) | C10A—C9A—N1A—N2A | −3.3 (3) |
C4A—C5A—C6A—C9A | 177.89 (16) | C6B—C9B—N1B—N2B | 179.76 (14) |
C4B—C5B—C6B—C7B | 1.4 (3) | C10B—C9B—N1B—N2B | −0.6 (3) |
C4B—C5B—C6B—C9B | −179.04 (17) | N3A—C11A—N2A—N1A | −7.3 (2) |
C5A—C6A—C7A—C8A | 1.0 (2) | S1A—C11A—N2A—N1A | 173.06 (12) |
C9A—C6A—C7A—C8A | −177.17 (15) | C9A—N1A—N2A—C11A | 168.09 (16) |
C5B—C6B—C7B—C8B | −1.2 (3) | N3B—C11B—N2B—N1B | 3.0 (3) |
C9B—C6B—C7B—C8B | 179.30 (17) | S1B—C11B—N2B—N1B | −174.85 (12) |
C4A—C3A—C8A—C7A | −0.2 (3) | C9B—N1B—N2B—C11B | 172.12 (16) |
O2A—C3A—C8A—C7A | 174.20 (15) | O1A—C2A—O2A—C3A | 7.0 (3) |
C6A—C7A—C8A—C3A | −0.8 (3) | C1A—C2A—O2A—C3A | −173.17 (16) |
C4B—C3B—C8B—C7B | 1.8 (3) | C8A—C3A—O2A—C2A | 67.9 (2) |
O2B—C3B—C8B—C7B | 178.94 (17) | C4A—C3A—O2A—C2A | −117.52 (19) |
C6B—C7B—C8B—C3B | −0.4 (3) | O1B—C2B—O2B—C3B | 0.6 (3) |
C7A—C6A—C9A—N1A | 164.41 (16) | C1B—C2B—O2B—C3B | 179.85 (16) |
C5A—C6A—C9A—N1A | −13.8 (2) | C8B—C3B—O2B—C2B | 84.9 (2) |
C7A—C6A—C9A—C10A | −15.2 (3) | C4B—C3B—O2B—C2B | −97.9 (2) |
Cg1 and Cg2 are the centroids of the C3A–C8A and C3B–C8B rings, respectively. |
D—H···A | D—H | H···A | D···A | D—H···A |
N3A—H3A1···N1A | 0.86 | 2.26 | 2.617 (2) | 105 |
N3B—H3B1···N1B | 0.86 | 2.28 | 2.633 (2) | 105 |
N2A—H2A···S1B | 0.86 | 2.63 | 3.4724 (15) | 167 |
N2B—H2B···S1A | 0.86 | 2.71 | 3.4228 (16) | 141 |
N3A—H3A1···O1Bi | 0.86 | 2.44 | 3.164 (2) | 142 |
N3B—H3B2···S1Aii | 0.86 | 2.57 | 3.4262 (17) | 176 |
N3A—H3A2···Cg2iii | 0.86 | 2.62 | 3.4763 (19) | 130 |
C1B—H1B3···Cg1iv | 0.96 | 2.73 | 3.691 (3) | 154 |
Symmetry codes: (i) −x, −y+1, −z+1; (ii) x+1, y, z; (iii) −x, −y+1, −z; (iv) −x+1, −y+1, −z. |
C16H15N3O2S | Z = 2 |
Mr = 313.37 | F(000) = 328 |
Triclinic, P1 | Dx = 1.367 Mg m−3 |
a = 7.8145 (4) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 9.7538 (5) Å | Cell parameters from 3154 reflections |
c = 10.9050 (7) Å | θ = 2.0–26.5° |
α = 78.855 (4)° | µ = 0.22 mm−1 |
β = 69.031 (2)° | T = 293 K |
γ = 84.200 (3)° | Block, pale-yellow |
V = 761.05 (8) Å3 | 0.25 × 0.18 × 0.14 mm |
Bruker SMART APEXII area-detector diffractometer | 2857 reflections with I > 2σ(I) |
ω and φ scans | Rint = 0.027 |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | θmax = 26.5°, θmin = 2.0° |
Tmin = 0.745, Tmax = 0.865 | h = −8→9 |
11596 measured reflections | k = −12→12 |
3154 independent reflections | l = −13→13 |
Refinement on F2 | Hydrogen site location: inferred from neighbouring sites |
Least-squares matrix: full | H-atom parameters constrained |
R[F2 > 2σ(F2)] = 0.034 | w = 1/[σ2(Fo2) + (0.0512P)2 + 0.1914P] where P = (Fo2 + 2Fc2)/3 |
wR(F2) = 0.099 | (Δ/σ)max = 0.001 |
S = 1.05 | Δρmax = 0.26 e Å−3 |
3154 reflections | Δρmin = −0.29 e Å−3 |
201 parameters | Extinction correction: SHELXL2014 (Sheldrick, 2015), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
0 restraints | Extinction coefficient: 0.080 (6) |
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 | ||
C1 | −0.0574 (2) | 0.60395 (15) | 0.12357 (14) | 0.0461 (3) | |
H1 | 0.0581 | 0.6165 | 0.1252 | 0.055* | |
C2 | −0.1286 (2) | 0.69706 (17) | 0.03984 (16) | 0.0562 (4) | |
H2 | −0.0616 | 0.7736 | −0.0138 | 0.067* | |
C3 | −0.2978 (3) | 0.67730 (18) | 0.03519 (16) | 0.0596 (4) | |
H3 | −0.3439 | 0.7398 | −0.0223 | 0.072* | |
C4 | −0.3993 (2) | 0.56519 (19) | 0.11541 (17) | 0.0579 (4) | |
H4 | −0.5134 | 0.5519 | 0.1117 | 0.069* | |
C5 | −0.3315 (2) | 0.47264 (16) | 0.20141 (15) | 0.0483 (3) | |
H5 | −0.4005 | 0.3977 | 0.2567 | 0.058* | |
C6 | −0.15975 (18) | 0.49176 (14) | 0.20510 (12) | 0.0384 (3) | |
C7 | −0.09783 (18) | 0.39381 (14) | 0.30353 (12) | 0.0392 (3) | |
C8 | 0.15463 (18) | 0.31751 (15) | 0.37198 (13) | 0.0400 (3) | |
C9 | 0.15816 (19) | 0.17391 (15) | 0.39018 (14) | 0.0442 (3) | |
H9 | 0.1159 | 0.1286 | 0.3395 | 0.053* | |
C10 | 0.22566 (19) | 0.09777 (14) | 0.48531 (14) | 0.0412 (3) | |
H10 | 0.2247 | 0.0006 | 0.5004 | 0.049* | |
C11 | 0.29489 (16) | 0.16457 (13) | 0.55862 (12) | 0.0346 (3) | |
C12 | 0.29666 (19) | 0.31025 (14) | 0.53336 (14) | 0.0406 (3) | |
H12 | 0.3466 | 0.3565 | 0.5790 | 0.049* | |
C13 | 0.22498 (19) | 0.38662 (14) | 0.44118 (14) | 0.0433 (3) | |
H13 | 0.2243 | 0.4838 | 0.4260 | 0.052* | |
C14 | 0.36348 (17) | 0.08555 (13) | 0.66391 (12) | 0.0353 (3) | |
C15 | 0.2849 (2) | −0.05203 (16) | 0.73732 (16) | 0.0549 (4) | |
H15A | 0.3642 | −0.1019 | 0.7820 | 0.082* | |
H15B | 0.2737 | −0.1056 | 0.6755 | 0.082* | |
H15C | 0.1661 | −0.0373 | 0.8018 | 0.082* | |
C16 | 0.70223 (17) | 0.13075 (13) | 0.78932 (12) | 0.0358 (3) | |
N1 | 0.48733 (14) | 0.14652 (11) | 0.68311 (10) | 0.0361 (2) | |
N2 | 0.54777 (15) | 0.08471 (11) | 0.78611 (11) | 0.0374 (2) | |
H2A | 0.4883 | 0.0188 | 0.8464 | 0.045* | |
N3 | 0.79854 (16) | 0.21798 (13) | 0.68277 (11) | 0.0467 (3) | |
H3A | 0.7611 | 0.2423 | 0.6162 | 0.056* | |
H3B | 0.8984 | 0.2502 | 0.6803 | 0.056* | |
O1 | −0.19599 (15) | 0.31803 (12) | 0.39711 (10) | 0.0550 (3) | |
O2 | 0.08423 (13) | 0.40017 (11) | 0.27880 (9) | 0.0477 (3) | |
S1 | 0.77088 (5) | 0.07598 (4) | 0.92056 (4) | 0.05405 (15) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0487 (8) | 0.0491 (8) | 0.0399 (7) | −0.0026 (6) | −0.0165 (6) | −0.0032 (6) |
C2 | 0.0671 (10) | 0.0487 (8) | 0.0458 (8) | 0.0029 (7) | −0.0183 (7) | 0.0033 (6) |
C3 | 0.0728 (11) | 0.0613 (10) | 0.0465 (8) | 0.0207 (8) | −0.0300 (8) | −0.0070 (7) |
C4 | 0.0528 (9) | 0.0721 (10) | 0.0583 (9) | 0.0112 (8) | −0.0323 (8) | −0.0149 (8) |
C5 | 0.0451 (8) | 0.0555 (8) | 0.0467 (8) | −0.0013 (6) | −0.0206 (6) | −0.0055 (6) |
C6 | 0.0423 (7) | 0.0432 (7) | 0.0315 (6) | 0.0014 (5) | −0.0157 (5) | −0.0067 (5) |
C7 | 0.0409 (7) | 0.0454 (7) | 0.0333 (6) | −0.0030 (5) | −0.0159 (5) | −0.0048 (5) |
C8 | 0.0341 (6) | 0.0523 (7) | 0.0320 (6) | −0.0008 (5) | −0.0134 (5) | 0.0004 (5) |
C9 | 0.0457 (7) | 0.0526 (8) | 0.0419 (7) | 0.0009 (6) | −0.0224 (6) | −0.0131 (6) |
C10 | 0.0426 (7) | 0.0409 (7) | 0.0447 (7) | 0.0023 (5) | −0.0196 (6) | −0.0112 (5) |
C11 | 0.0308 (6) | 0.0398 (6) | 0.0328 (6) | 0.0008 (5) | −0.0115 (5) | −0.0055 (5) |
C12 | 0.0425 (7) | 0.0419 (7) | 0.0429 (7) | −0.0020 (5) | −0.0211 (6) | −0.0073 (5) |
C13 | 0.0451 (7) | 0.0394 (7) | 0.0473 (7) | −0.0026 (5) | −0.0214 (6) | −0.0006 (5) |
C14 | 0.0332 (6) | 0.0384 (6) | 0.0345 (6) | 0.0000 (5) | −0.0128 (5) | −0.0054 (5) |
C15 | 0.0616 (10) | 0.0520 (8) | 0.0568 (9) | −0.0181 (7) | −0.0328 (8) | 0.0094 (7) |
C16 | 0.0333 (6) | 0.0364 (6) | 0.0365 (6) | −0.0022 (5) | −0.0130 (5) | −0.0010 (5) |
N1 | 0.0360 (5) | 0.0396 (5) | 0.0339 (5) | −0.0005 (4) | −0.0162 (4) | −0.0013 (4) |
N2 | 0.0365 (6) | 0.0404 (6) | 0.0354 (5) | −0.0073 (4) | −0.0166 (4) | 0.0047 (4) |
N3 | 0.0427 (6) | 0.0574 (7) | 0.0394 (6) | −0.0168 (5) | −0.0187 (5) | 0.0098 (5) |
O1 | 0.0480 (6) | 0.0675 (7) | 0.0456 (6) | −0.0137 (5) | −0.0208 (5) | 0.0146 (5) |
O2 | 0.0404 (5) | 0.0622 (6) | 0.0387 (5) | −0.0055 (4) | −0.0193 (4) | 0.0083 (4) |
S1 | 0.0454 (2) | 0.0720 (3) | 0.0464 (2) | −0.01842 (18) | −0.02749 (17) | 0.01713 (18) |
C1—C2 | 1.381 (2) | C10—C11 | 1.3923 (18) |
C1—C6 | 1.3853 (19) | C10—H10 | 0.9300 |
C1—H1 | 0.9300 | C11—C12 | 1.3947 (18) |
C2—C3 | 1.375 (3) | C11—C14 | 1.4881 (17) |
C2—H2 | 0.9300 | C12—C13 | 1.3815 (18) |
C3—C4 | 1.378 (3) | C12—H12 | 0.9300 |
C3—H3 | 0.9300 | C13—H13 | 0.9300 |
C4—C5 | 1.381 (2) | C14—N1 | 1.2820 (16) |
C4—H4 | 0.9300 | C14—C15 | 1.4894 (18) |
C5—C6 | 1.389 (2) | C15—H15A | 0.9600 |
C5—H5 | 0.9300 | C15—H15B | 0.9600 |
C6—C7 | 1.4767 (17) | C15—H15C | 0.9600 |
C7—O1 | 1.1995 (16) | C16—N3 | 1.3273 (16) |
C7—O2 | 1.3555 (16) | C16—N2 | 1.3437 (16) |
C8—C9 | 1.375 (2) | C16—S1 | 1.6785 (13) |
C8—C13 | 1.376 (2) | N1—N2 | 1.3816 (14) |
C8—O2 | 1.4067 (15) | N2—H2A | 0.8600 |
C9—C10 | 1.3858 (19) | N3—H3A | 0.8600 |
C9—H9 | 0.9300 | N3—H3B | 0.8600 |
C2—C1—C6 | 119.40 (14) | C10—C11—C12 | 118.52 (12) |
C2—C1—H1 | 120.3 | C10—C11—C14 | 122.07 (11) |
C6—C1—H1 | 120.3 | C12—C11—C14 | 119.40 (11) |
C3—C2—C1 | 120.47 (15) | C13—C12—C11 | 120.66 (12) |
C3—C2—H2 | 119.8 | C13—C12—H12 | 119.7 |
C1—C2—H2 | 119.8 | C11—C12—H12 | 119.7 |
C2—C3—C4 | 120.27 (14) | C8—C13—C12 | 119.37 (13) |
C2—C3—H3 | 119.9 | C8—C13—H13 | 120.3 |
C4—C3—H3 | 119.9 | C12—C13—H13 | 120.3 |
C3—C4—C5 | 119.92 (16) | N1—C14—C11 | 114.67 (11) |
C3—C4—H4 | 120.0 | N1—C14—C15 | 126.07 (12) |
C5—C4—H4 | 120.0 | C11—C14—C15 | 119.26 (11) |
C4—C5—C6 | 119.80 (14) | C14—C15—H15A | 109.5 |
C4—C5—H5 | 120.1 | C14—C15—H15B | 109.5 |
C6—C5—H5 | 120.1 | H15A—C15—H15B | 109.5 |
C1—C6—C5 | 120.12 (13) | C14—C15—H15C | 109.5 |
C1—C6—C7 | 122.27 (12) | H15A—C15—H15C | 109.5 |
C5—C6—C7 | 117.51 (12) | H15B—C15—H15C | 109.5 |
O1—C7—O2 | 122.72 (12) | N3—C16—N2 | 116.66 (11) |
O1—C7—C6 | 124.71 (12) | N3—C16—S1 | 122.30 (10) |
O2—C7—C6 | 112.56 (11) | N2—C16—S1 | 121.02 (9) |
C9—C8—C13 | 121.44 (12) | C14—N1—N2 | 118.03 (10) |
C9—C8—O2 | 121.45 (12) | C16—N2—N1 | 117.98 (10) |
C13—C8—O2 | 117.08 (12) | C16—N2—H2A | 121.0 |
C8—C9—C10 | 118.95 (12) | N1—N2—H2A | 121.0 |
C8—C9—H9 | 120.5 | C16—N3—H3A | 120.0 |
C10—C9—H9 | 120.5 | C16—N3—H3B | 120.0 |
C9—C10—C11 | 120.96 (12) | H3A—N3—H3B | 120.0 |
C9—C10—H10 | 119.5 | C7—O2—C8 | 116.96 (10) |
C11—C10—H10 | 119.5 | ||
C6—C1—C2—C3 | −1.3 (2) | C14—C11—C12—C13 | −176.57 (12) |
C1—C2—C3—C4 | 0.8 (3) | C9—C8—C13—C12 | −1.6 (2) |
C2—C3—C4—C5 | 0.4 (3) | O2—C8—C13—C12 | −179.67 (12) |
C3—C4—C5—C6 | −1.0 (2) | C11—C12—C13—C8 | −1.3 (2) |
C2—C1—C6—C5 | 0.7 (2) | C10—C11—C14—N1 | 152.10 (12) |
C2—C1—C6—C7 | −175.72 (13) | C12—C11—C14—N1 | −28.98 (17) |
C4—C5—C6—C1 | 0.5 (2) | C10—C11—C14—C15 | −28.60 (19) |
C4—C5—C6—C7 | 177.06 (13) | C12—C11—C14—C15 | 150.32 (14) |
C1—C6—C7—O1 | 160.66 (14) | C11—C14—N1—N2 | 175.16 (10) |
C5—C6—C7—O1 | −15.8 (2) | C15—C14—N1—N2 | −4.1 (2) |
C1—C6—C7—O2 | −18.01 (18) | N3—C16—N2—N1 | −9.43 (18) |
C5—C6—C7—O2 | 165.53 (12) | S1—C16—N2—N1 | 172.24 (9) |
C13—C8—C9—C10 | 3.3 (2) | C14—N1—N2—C16 | 166.17 (12) |
O2—C8—C9—C10 | −178.70 (12) | O1—C7—O2—C8 | −2.8 (2) |
C8—C9—C10—C11 | −2.2 (2) | C6—C7—O2—C8 | 175.91 (11) |
C9—C10—C11—C12 | −0.6 (2) | C9—C8—O2—C7 | 66.31 (17) |
C9—C10—C11—C14 | 178.29 (12) | C13—C8—O2—C7 | −115.64 (14) |
C10—C11—C12—C13 | 2.4 (2) |
Cg2 is the centroid of the C8–C13 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3A···N1 | 0.86 | 2.24 | 2.5953 (18) | 105 |
N2—H2A···S1i | 0.86 | 2.68 | 3.4697 (12) | 153 |
N3—H3A···O1ii | 0.86 | 2.27 | 3.0653 (15) | 153 |
C15—H15B···O1iii | 0.96 | 2.55 | 3.454 (2) | 156 |
N3—H3B···Cg2ii | 0.86 | 2.47 | 3.3385 (15) | 122 |
Symmetry codes: (i) −x+1, −y, −z+2; (ii) x+1, y, z; (iii) −x, −y, −z+1. |
Acknowledgements
The authors thank the TBI X-ray facility, CAS in Crystallography and Biophysics, University of Madras, India, for the data collection. VV thanks the DBT, Government of India, for a fellowship.
References
Arora, S., Agarwal, S. & Singhal, S. (2014). Int. J. Pharm. Pharm. Sci. 6, 9, 34–41. Google Scholar
Bruker (2008). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Farrugia, L. J. (2012). J. Appl. Cryst. 45, 849–854. Web of Science CrossRef CAS IUCr Journals Google Scholar
Fatondji, H. R., Kpoviessi, S., Gbaguidi, F., Bero, J., Hannaert, V., Quetin-Leclercq, J., Poupaert, J., Moudachirou, M. & Accrombessi, G. C. (2013). Med. Chem. Res. 22, 2151–2162. Web of Science CrossRef CAS Google Scholar
Groom, C. R., Bruno, I. J., Lightfoot, M. P. & Ward, S. C. (2016). Acta Cryst. B72, 171–179. Web of Science CSD CrossRef IUCr Journals Google Scholar
Macrae, C. F., Bruno, I. J., Chisholm, J. A., Edgington, P. R., McCabe, P., Pidcock, E., Rodriguez-Monge, L., Taylor, R., van de Streek, J. & Wood, P. A. (2008). J. Appl. Cryst. 41, 466–470. Web of Science CSD CrossRef CAS IUCr Journals Google Scholar
Mani, K. A., Viswanathan, V., Narasimhan, S. & Velmurugan, D. (2015). Acta Cryst. E71, o43–o44. CSD CrossRef IUCr Journals Google Scholar
Parul, N., Subhangkar, N. & Arun, M. (2012). Inter. Res. J. Phar. 3, 5, 350–363. Google Scholar
Seena, E. B., Manoj, E. & Kurup, M. R. P (2006). Acta Cryst. C62, o486–o488. Web of Science CSD CrossRef CAS IUCr Journals 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
Singh, R., Mishra, P. S. & Mishra, R. (2011). Inter. J. PharmTech. Res. 3, 3, 1625–1629. Google Scholar
Spek, A. L. (2009). Acta Cryst. D65, 148–155. Web of Science CrossRef CAS IUCr Journals Google Scholar
Venkatesh, K., Rayam, P., Sekhar, K. P. C. & Mukkanti, K. (2016). Int. J. Appl. Biol. Pharm. Tech. 7, 258–266. Google Scholar
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