Literature DB >> 22412641

1-{2-[(4-Chloro-benzyl-idene)amino]phen-yl}-3-phenyl-thio-urea.

Peng-Gang Liu1, Xiao-Ning Wang, Yong-An Yang, Hai-Liang Zhu.   

Abstract

The asymmetric unit of the title compound, C(20)H(16)ClN(3)S, contains two independent mol-ecules, A and B. In mol-ecule A, the dihedral angles between the central benzene ring and the pendant chloro-benzene and phenyl rings are 6.37 (15) and 64.79 (15)°, respectively. The corresponding values in mol-ecule B are 28.21 (14) and 82.11 (16)°, respectively. Each mol-ecule features an intra-molecular N-H⋯N hydrogen bond, which generates an S(5) ring. In the crystal, mol-ecules A and B form dimers, being linked by two N-H⋯S hydrogen bonds with graph-set notation R(2) (2)(8).

Entities:  

Year:  2012        PMID: 22412641      PMCID: PMC3295530          DOI: 10.1107/S1600536812006228

Source DB:  PubMed          Journal:  Acta Crystallogr Sect E Struct Rep Online        ISSN: 1600-5368


Related literature

For background to the coordination chemistry of Schiff bases, see: Chen et al. (2010 ▶); Cui et al. (2011 ▶). For hydrogen-bond motifs, see: Bernstein et al. (1995 ▶).

Experimental

Crystal data

C20H16ClN3S M = 365.87 Monoclinic, a = 9.410 (3) Å b = 23.079 (3) Å c = 16.807 (2) Å β = 100.226 (2)° V = 3592.0 (13) Å3 Z = 8 Mo Kα radiation μ = 0.34 mm−1 T = 298 K 0.17 × 0.15 × 0.15 mm

Data collection

Bruker SMART CCD area-detector diffractometer Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ▶) T min = 0.945, T max = 0.951 25609 measured reflections 6680 independent reflections 4051 reflections with I > 2σ(I) R int = 0.064

Refinement

R[F 2 > 2σ(F 2)] = 0.049 wR(F 2) = 0.117 S = 1.00 6680 reflections 463 parameters 4 restraints H atoms treated by a mixture of independent and constrained refinement Δρmax = 0.31 e Å−3 Δρmin = −0.27 e Å−3 Data collection: SMART (Bruker, 1998 ▶); cell refinement: SAINT (Bruker, 1998 ▶); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: SHELXTL (Sheldrick, 2008 ▶); software used to prepare material for publication: SHELXTL. Crystal structure: contains datablock(s) global, I. DOI: 10.1107/S1600536812006228/hb6632sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536812006228/hb6632Isup2.hkl Supplementary material file. DOI: 10.1107/S1600536812006228/hb6632Isup3.cml Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C20H16ClN3SF(000) = 1520
Mr = 365.87Dx = 1.353 Mg m3
Monoclinic, P21/nMo Kα radiation, λ = 0.71073 Å
a = 9.410 (3) ÅCell parameters from 4472 reflections
b = 23.079 (3) Åθ = 2.4–24.5°
c = 16.807 (2) ŵ = 0.34 mm1
β = 100.226 (2)°T = 298 K
V = 3592.0 (13) Å3Block, yellow
Z = 80.17 × 0.15 × 0.15 mm
Bruker SMART CCD area-detector diffractometer6680 independent reflections
Radiation source: fine-focus sealed tube4051 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.064
ω scansθmax = 25.5°, θmin = 2.2°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)h = −11→11
Tmin = 0.945, Tmax = 0.951k = −27→26
25609 measured reflectionsl = −20→20
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.049Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.117H atoms treated by a mixture of independent and constrained refinement
S = 1.00w = 1/[σ2(Fo2) + (0.0334P)2 + 1.8733P] where P = (Fo2 + 2Fc2)/3
6680 reflections(Δ/σ)max < 0.001
463 parametersΔρmax = 0.31 e Å3
4 restraintsΔρmin = −0.27 e Å3
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s 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 > σ(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*/Ueq
Cl10.63112 (12)0.39717 (5)−0.02622 (6)0.0897 (3)
Cl20.63346 (9)0.20059 (4)0.47794 (5)0.0672 (3)
N10.2757 (2)0.37248 (10)0.28692 (14)0.0453 (6)
N20.1379 (3)0.28279 (10)0.32759 (15)0.0494 (6)
N30.1149 (3)0.19376 (10)0.27030 (15)0.0496 (6)
N40.2947 (2)0.10566 (9)0.77336 (13)0.0396 (6)
N50.2405 (3)−0.00077 (10)0.81666 (14)0.0462 (6)
N60.2450 (3)−0.08378 (10)0.74386 (17)0.0540 (7)
S1−0.09328 (8)0.21834 (4)0.34837 (5)0.0560 (2)
S20.03254 (10)−0.07857 (4)0.82505 (5)0.0639 (3)
C10.4126 (3)0.40775 (12)0.18976 (17)0.0421 (7)
C20.4179 (3)0.35595 (13)0.14910 (18)0.0509 (8)
H2A0.37670.32300.16730.061*
C30.4832 (3)0.35242 (14)0.08212 (19)0.0573 (9)
H3A0.48570.31740.05490.069*
C40.5446 (3)0.40117 (15)0.05601 (18)0.0549 (8)
C50.5406 (3)0.45284 (14)0.09521 (19)0.0584 (9)
H5A0.58300.48560.07720.070*
C60.4738 (3)0.45629 (13)0.16128 (18)0.0532 (8)
H6A0.46970.49170.18720.064*
C70.3428 (3)0.41324 (12)0.25979 (17)0.0453 (7)
H70.34770.44880.28620.054*
C80.2020 (3)0.38065 (13)0.35255 (17)0.0448 (7)
C90.1256 (3)0.33273 (12)0.37331 (17)0.0441 (7)
C100.0506 (3)0.33636 (14)0.43690 (19)0.0599 (9)
H100.00210.30420.45190.072*
C110.0481 (4)0.38780 (16)0.4776 (2)0.0720 (11)
H11−0.00410.39040.51960.086*
C120.1207 (4)0.43513 (16)0.4576 (2)0.0707 (10)
H120.11780.46970.48560.085*
C130.1980 (3)0.43156 (14)0.3960 (2)0.0620 (9)
H130.24870.46380.38310.074*
C140.0607 (3)0.23353 (12)0.31572 (16)0.0430 (7)
C150.2432 (3)0.19785 (11)0.23773 (18)0.0420 (7)
C160.3757 (3)0.20611 (12)0.2862 (2)0.0533 (8)
H160.38220.21060.34170.064*
C170.4981 (3)0.20764 (13)0.2527 (2)0.0611 (9)
H170.58750.21360.28540.073*
C180.4892 (4)0.20044 (13)0.1708 (2)0.0623 (10)
H180.57250.20140.14820.075*
C190.3582 (4)0.19191 (14)0.1227 (2)0.0619 (9)
H190.35250.18670.06730.074*
C200.2348 (3)0.19091 (13)0.15560 (18)0.0519 (8)
H200.14550.18560.12250.062*
C210.5270 (3)0.18491 (13)0.54944 (16)0.0462 (7)
C220.5486 (3)0.13397 (13)0.59180 (17)0.0492 (8)
H220.61690.10740.58080.059*
C230.4681 (3)0.12249 (12)0.65079 (16)0.0438 (7)
H230.48240.08800.67980.053*
C240.3664 (3)0.16162 (12)0.66733 (16)0.0410 (7)
C250.3474 (3)0.21226 (13)0.62326 (19)0.0581 (9)
H250.27950.23910.63400.070*
C260.4263 (3)0.22396 (14)0.56382 (19)0.0578 (9)
H260.41120.25800.53390.069*
C270.2832 (3)0.15137 (12)0.73111 (16)0.0435 (7)
H270.21860.17970.74130.052*
C280.2163 (3)0.10037 (11)0.83720 (16)0.0371 (6)
C290.1911 (3)0.04411 (11)0.86153 (16)0.0393 (7)
C300.1266 (3)0.03522 (13)0.92816 (17)0.0515 (8)
H300.1132−0.00220.94580.062*
C310.0822 (3)0.08202 (14)0.96840 (18)0.0593 (9)
H310.03780.07601.01290.071*
C320.1031 (3)0.13720 (14)0.94326 (18)0.0578 (9)
H320.07040.16850.96990.069*
C330.1717 (3)0.14676 (12)0.87925 (17)0.0480 (8)
H330.18850.18450.86380.058*
C340.1802 (3)−0.05245 (12)0.79539 (17)0.0440 (7)
C350.3686 (4)−0.06772 (12)0.7116 (2)0.0520 (8)
C360.4987 (4)−0.05871 (14)0.7615 (3)0.0716 (10)
H360.5053−0.06120.81730.086*
C370.6190 (4)−0.04602 (17)0.7293 (4)0.1041 (17)
H370.7072−0.03990.76300.125*
C380.6087 (6)−0.0425 (2)0.6481 (4)0.130 (2)
H380.6904−0.03380.62640.155*
C390.4806 (7)−0.0514 (2)0.5980 (3)0.121 (2)
H390.4747−0.04890.54230.145*
C400.3587 (4)−0.06431 (15)0.6302 (2)0.0791 (11)
H400.2706−0.07060.59630.095*
H30.056 (3)0.1640 (10)0.2513 (18)0.080*
H50.306 (3)0.0129 (13)0.7888 (17)0.080*
H20.206 (3)0.2887 (14)0.2977 (16)0.080*
H60.196 (3)−0.1152 (9)0.7242 (18)0.080*
U11U22U33U12U13U23
Cl10.1045 (8)0.1059 (8)0.0690 (6)−0.0180 (6)0.0435 (6)0.0027 (6)
Cl20.0719 (6)0.0827 (6)0.0542 (5)−0.0080 (5)0.0309 (4)0.0078 (4)
N10.0449 (15)0.0425 (15)0.0515 (15)−0.0055 (12)0.0168 (12)−0.0050 (12)
N20.0490 (16)0.0439 (15)0.0614 (17)−0.0128 (13)0.0268 (13)−0.0102 (13)
N30.0427 (16)0.0472 (16)0.0636 (17)−0.0115 (12)0.0223 (13)−0.0136 (13)
N40.0411 (14)0.0353 (13)0.0456 (14)−0.0071 (11)0.0169 (11)−0.0012 (11)
N50.0530 (16)0.0330 (14)0.0586 (16)−0.0110 (12)0.0263 (13)−0.0028 (12)
N60.0528 (17)0.0396 (15)0.0752 (18)−0.0098 (12)0.0266 (15)−0.0134 (13)
S10.0452 (5)0.0555 (5)0.0733 (6)−0.0057 (4)0.0265 (4)−0.0005 (4)
S20.0714 (6)0.0557 (5)0.0735 (6)−0.0298 (4)0.0366 (5)−0.0149 (4)
C10.0356 (17)0.0412 (17)0.0486 (18)−0.0033 (13)0.0048 (14)0.0014 (14)
C20.0507 (19)0.0415 (18)0.064 (2)−0.0044 (15)0.0194 (16)0.0037 (15)
C30.059 (2)0.053 (2)0.063 (2)−0.0094 (16)0.0191 (18)−0.0069 (16)
C40.053 (2)0.065 (2)0.0474 (19)−0.0069 (17)0.0125 (16)0.0057 (17)
C50.061 (2)0.056 (2)0.059 (2)−0.0158 (17)0.0102 (18)0.0096 (17)
C60.055 (2)0.0438 (19)0.060 (2)−0.0093 (15)0.0083 (17)−0.0033 (16)
C70.0435 (18)0.0360 (17)0.0564 (19)−0.0006 (14)0.0091 (15)−0.0045 (14)
C80.0413 (18)0.0467 (18)0.0480 (18)−0.0018 (14)0.0120 (15)−0.0066 (14)
C90.0405 (17)0.0468 (18)0.0468 (17)−0.0014 (14)0.0123 (14)−0.0083 (14)
C100.063 (2)0.062 (2)0.062 (2)−0.0146 (17)0.0292 (18)−0.0150 (17)
C110.072 (2)0.084 (3)0.068 (2)−0.015 (2)0.035 (2)−0.031 (2)
C120.073 (3)0.067 (2)0.079 (3)−0.008 (2)0.031 (2)−0.031 (2)
C130.063 (2)0.053 (2)0.075 (2)−0.0098 (17)0.0256 (19)−0.0158 (18)
C140.0417 (18)0.0441 (18)0.0446 (17)−0.0018 (14)0.0115 (14)0.0039 (14)
C150.0366 (17)0.0357 (16)0.0560 (19)−0.0053 (13)0.0143 (15)−0.0076 (14)
C160.043 (2)0.0516 (19)0.065 (2)−0.0057 (15)0.0072 (17)−0.0106 (16)
C170.0367 (19)0.051 (2)0.093 (3)−0.0062 (15)0.0049 (18)−0.0107 (19)
C180.048 (2)0.048 (2)0.099 (3)−0.0031 (16)0.038 (2)−0.0011 (19)
C190.066 (2)0.063 (2)0.064 (2)0.0006 (19)0.032 (2)−0.0002 (18)
C200.0467 (19)0.056 (2)0.054 (2)−0.0030 (16)0.0122 (16)−0.0037 (16)
C210.0452 (19)0.057 (2)0.0398 (17)−0.0072 (15)0.0155 (14)0.0023 (15)
C220.0450 (19)0.058 (2)0.0459 (18)0.0050 (15)0.0110 (15)0.0004 (15)
C230.0439 (18)0.0454 (17)0.0425 (17)−0.0005 (14)0.0085 (14)0.0069 (14)
C240.0415 (17)0.0419 (17)0.0412 (16)−0.0080 (14)0.0120 (14)0.0021 (13)
C250.063 (2)0.0445 (18)0.074 (2)0.0083 (16)0.0326 (18)0.0138 (17)
C260.065 (2)0.050 (2)0.063 (2)−0.0006 (17)0.0235 (18)0.0198 (16)
C270.0451 (18)0.0389 (17)0.0493 (18)−0.0029 (14)0.0161 (15)−0.0033 (14)
C280.0367 (16)0.0363 (15)0.0403 (16)−0.0071 (12)0.0125 (13)−0.0022 (13)
C290.0389 (17)0.0374 (16)0.0433 (16)−0.0092 (13)0.0118 (14)−0.0025 (13)
C300.062 (2)0.0483 (19)0.0479 (18)−0.0190 (16)0.0195 (16)−0.0002 (15)
C310.071 (2)0.063 (2)0.0509 (19)−0.0208 (18)0.0312 (18)−0.0123 (17)
C320.068 (2)0.054 (2)0.057 (2)−0.0108 (17)0.0280 (18)−0.0163 (16)
C330.058 (2)0.0384 (17)0.0521 (19)−0.0102 (14)0.0215 (16)−0.0059 (14)
C340.0496 (19)0.0340 (16)0.0503 (18)−0.0050 (14)0.0138 (15)0.0012 (14)
C350.053 (2)0.0308 (16)0.078 (2)−0.0016 (15)0.0276 (19)−0.0131 (16)
C360.058 (2)0.050 (2)0.110 (3)−0.0070 (18)0.024 (2)−0.012 (2)
C370.062 (3)0.065 (3)0.194 (5)−0.013 (2)0.048 (3)−0.047 (3)
C380.127 (5)0.089 (3)0.206 (6)−0.048 (3)0.120 (5)−0.074 (4)
C390.162 (5)0.111 (4)0.116 (4)−0.053 (4)0.096 (4)−0.049 (3)
C400.091 (3)0.072 (3)0.083 (3)−0.010 (2)0.038 (2)−0.021 (2)
Cl1—C41.726 (3)C15—C201.378 (4)
Cl2—C211.733 (3)C16—C171.370 (4)
N1—C71.262 (3)C16—H160.9300
N1—C81.416 (3)C17—C181.374 (4)
N2—C141.345 (3)C17—H170.9300
N2—C91.401 (3)C18—C191.363 (4)
N2—H20.896 (10)C18—H180.9300
N3—C141.350 (3)C19—C201.373 (4)
N3—C151.415 (3)C19—H190.9300
N3—H30.905 (10)C20—H200.9300
N4—C271.266 (3)C21—C261.360 (4)
N4—C281.411 (3)C21—C221.371 (4)
N5—C341.342 (3)C22—C231.376 (4)
N5—C291.408 (3)C22—H220.9300
N5—H50.895 (10)C23—C241.380 (4)
N6—C341.354 (3)C23—H230.9300
N6—C351.416 (4)C24—C251.378 (4)
N6—H60.892 (10)C24—C271.454 (3)
S1—C141.675 (3)C25—C261.374 (4)
S2—C341.670 (3)C25—H250.9300
C1—C21.382 (4)C26—H260.9300
C1—C61.384 (4)C27—H270.9300
C1—C71.452 (4)C28—C331.388 (4)
C2—C31.378 (4)C28—C291.394 (3)
C2—H2A0.9300C29—C301.381 (3)
C3—C41.372 (4)C30—C311.378 (4)
C3—H3A0.9300C30—H300.9300
C4—C51.366 (4)C31—C321.367 (4)
C5—C61.372 (4)C31—H310.9300
C5—H5A0.9300C32—C331.367 (4)
C6—H6A0.9300C32—H320.9300
C7—H70.9300C33—H330.9300
C8—C131.388 (4)C35—C401.357 (4)
C8—C91.397 (4)C35—C361.371 (5)
C9—C101.384 (4)C36—C371.370 (5)
C10—C111.373 (4)C36—H360.9300
C10—H100.9300C37—C381.352 (7)
C11—C121.363 (5)C37—H370.9300
C11—H110.9300C38—C391.359 (7)
C12—C131.369 (4)C38—H380.9300
C12—H120.9300C39—C401.385 (5)
C13—H130.9300C39—H390.9300
C15—C161.376 (4)C40—H400.9300
C7—N1—C8121.8 (2)C17—C18—H18120.0
C14—N2—C9133.0 (2)C18—C19—C20120.3 (3)
C14—N2—H2118 (2)C18—C19—H19119.9
C9—N2—H2109 (2)C20—C19—H19119.9
C14—N3—C15127.4 (2)C19—C20—C15120.0 (3)
C14—N3—H3117 (2)C19—C20—H20120.0
C15—N3—H3115 (2)C15—C20—H20120.0
C27—N4—C28119.7 (2)C26—C21—C22121.3 (3)
C34—N5—C29129.2 (2)C26—C21—Cl2119.4 (2)
C34—N5—H5118 (2)C22—C21—Cl2119.3 (2)
C29—N5—H5110 (2)C21—C22—C23119.3 (3)
C34—N6—C35126.8 (2)C21—C22—H22120.3
C34—N6—H6114 (2)C23—C22—H22120.3
C35—N6—H6119 (2)C22—C23—C24120.6 (3)
C2—C1—C6118.4 (3)C22—C23—H23119.7
C2—C1—C7122.5 (3)C24—C23—H23119.7
C6—C1—C7119.1 (3)C25—C24—C23118.4 (3)
C3—C2—C1121.1 (3)C25—C24—C27119.9 (3)
C3—C2—H2A119.5C23—C24—C27121.7 (3)
C1—C2—H2A119.5C26—C25—C24121.5 (3)
C4—C3—C2119.2 (3)C26—C25—H25119.3
C4—C3—H3A120.4C24—C25—H25119.3
C2—C3—H3A120.4C21—C26—C25118.9 (3)
C5—C4—C3120.8 (3)C21—C26—H26120.6
C5—C4—Cl1119.4 (2)C25—C26—H26120.6
C3—C4—Cl1119.8 (3)N4—C27—C24123.1 (3)
C4—C5—C6119.8 (3)N4—C27—H27118.5
C4—C5—H5A120.1C24—C27—H27118.5
C6—C5—H5A120.1C33—C28—C29119.1 (2)
C5—C6—C1120.8 (3)C33—C28—N4124.5 (2)
C5—C6—H6A119.6C29—C28—N4116.3 (2)
C1—C6—H6A119.6C30—C29—C28119.9 (3)
N1—C7—C1123.7 (3)C30—C29—N5124.0 (2)
N1—C7—H7118.1C28—C29—N5116.0 (2)
C1—C7—H7118.1C31—C30—C29119.8 (3)
C13—C8—C9118.4 (3)C31—C30—H30120.1
C13—C8—N1125.9 (3)C29—C30—H30120.1
C9—C8—N1115.7 (2)C32—C31—C30120.4 (3)
C10—C9—C8120.0 (3)C32—C31—H31119.8
C10—C9—N2125.2 (3)C30—C31—H31119.8
C8—C9—N2114.7 (2)C31—C32—C33120.5 (3)
C11—C10—C9119.6 (3)C31—C32—H32119.8
C11—C10—H10120.2C33—C32—H32119.8
C9—C10—H10120.2C32—C33—C28120.3 (3)
C12—C11—C10121.0 (3)C32—C33—H33119.9
C12—C11—H11119.5C28—C33—H33119.9
C10—C11—H11119.5N5—C34—N6115.3 (2)
C11—C12—C13119.8 (3)N5—C34—S2125.2 (2)
C11—C12—H12120.1N6—C34—S2119.5 (2)
C13—C12—H12120.1C40—C35—C36120.1 (3)
C12—C13—C8121.1 (3)C40—C35—N6119.1 (3)
C12—C13—H13119.4C36—C35—N6120.7 (3)
C8—C13—H13119.4C37—C36—C35120.1 (4)
N2—C14—N3114.2 (2)C37—C36—H36120.0
N2—C14—S1127.2 (2)C35—C36—H36120.0
N3—C14—S1118.6 (2)C38—C37—C36119.7 (5)
C16—C15—C20119.6 (3)C38—C37—H37120.1
C16—C15—N3121.7 (3)C36—C37—H37120.1
C20—C15—N3118.6 (3)C37—C38—C39120.8 (4)
C17—C16—C15119.9 (3)C37—C38—H38119.6
C17—C16—H16120.0C39—C38—H38119.6
C15—C16—H16120.0C38—C39—C40119.7 (5)
C16—C17—C18120.2 (3)C38—C39—H39120.1
C16—C17—H17119.9C40—C39—H39120.1
C18—C17—H17119.9C35—C40—C39119.5 (4)
C19—C18—C17120.0 (3)C35—C40—H40120.2
C19—C18—H18120.0C39—C40—H40120.2
D—H···AD—HH···AD···AD—H···A
N6—H6···S1i0.89 (1)2.77 (1)3.647 (3)168 (3)
N2—H2···N10.90 (1)2.06 (3)2.598 (3)118 (3)
N5—H5···N40.90 (1)2.16 (3)2.637 (3)113 (2)
N3—H3···S2i0.91 (1)2.42 (2)3.282 (2)160 (3)
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯AD—HH⋯ADAD—H⋯A
N6—H6⋯S1i0.89 (1)2.77 (1)3.647 (3)168 (3)
N2—H2⋯N10.90 (1)2.06 (3)2.598 (3)118 (3)
N5—H5⋯N40.90 (1)2.16 (3)2.637 (3)113 (2)
N3—H3⋯S2i0.91 (1)2.42 (2)3.282 (2)160 (3)

Symmetry code: (i) .

  2 in total

1.  Synthesis, molecular docking and biological evaluation of Schiff base transition metal complexes as potential urease inhibitors.

Authors:  Wu Chen; Yuguang Li; Yongming Cui; Xian Zhang; Hai-Liang Zhu; Qingfu Zeng
Journal:  Eur J Med Chem       Date:  2010-07-14       Impact factor: 6.514

2.  A short history of SHELX.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr A       Date:  2007-12-21       Impact factor: 2.290

  2 in total

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