Literature DB >> 22798820

(2E)-2-[(3-Methyl-5-phen-oxy-1-phenyl-1H-pyrazol-4-yl)methyl-idene]hydrazinecarbothio-amide.

Hoong-Kun Fun, Ching Kheng Quah, Shobhitha Shetty, Balakrishna Kalluraya.   

Abstract

In the title compound, C(18)H(17)N(5)OS, the mean plane of the pyrazole ring [maximum deviation = 0.0031 (12) Å] forms dihedral angles of 19.6 (4) and 9.3 (5)° with the two disorder components of the N-bound benzene ring (with equal occupancies for the two orientations) and a dihedral angle of 72.58 (8)° with the C-O-bonded benzene ring. The mol-ecule exists in a trans conformation with respect to the N=C bond [1.2792 (19) Å]. The mol-ecular structure features an intra-molecular C-H⋯O hydrogen bond, forming an S(6) ring. In the crystal, N-H⋯N and N-H⋯S hydrogen bonds result in the formation of zigzag layers lying parallel to (10-1).

Entities:  

Year:  2012        PMID: 22798820      PMCID: PMC3393955          DOI: 10.1107/S1600536812026931

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


Related literature

For general background to and applications of the pyrazole derivatives, see: Rai et al. (2008 ▶); Isloor et al. (2009 ▶); Girisha et al. (2010 ▶). For standard bond-length data, see: Allen et al. (1987 ▶). For the stability of the temperature controller used in the data collection, see Cosier & Glazer (1986 ▶). For hydrogen-bond motifs, see: Bernstein et al. (1995 ▶). For related structures, see: Fun et al. (2011a ▶,b ▶,c ▶).

Experimental

Crystal data

C18H17N5OS M = 351.43 Monoclinic, a = 8.8280 (1) Å b = 10.8519 (2) Å c = 17.7353 (2) Å β = 94.379 (1)° V = 1694.09 (4) Å3 Z = 4 Mo Kα radiation μ = 0.21 mm−1 T = 100 K 0.29 × 0.27 × 0.22 mm

Data collection

Bruker SMART APEXII CCD diffractometer Absorption correction: multi-scan (SADABS; Bruker, 2009 ▶) T min = 0.942, T max = 0.955 18467 measured reflections 4948 independent reflections 3879 reflections with I > 2σ(I) R int = 0.042

Refinement

R[F 2 > 2σ(F 2)] = 0.046 wR(F 2) = 0.113 S = 1.06 4948 reflections 294 parameters 216 restraints H atoms treated by a mixture of independent and constrained refinement Δρmax = 0.43 e Å−3 Δρmin = −0.26 e Å−3 Data collection: APEX2 (Bruker, 2009 ▶); cell refinement: SAINT (Bruker, 2009 ▶); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009 ▶). Crystal structure: contains datablock(s) global, I. DOI: 10.1107/S1600536812026931/hb6849sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536812026931/hb6849Isup2.hkl Supplementary material file. DOI: 10.1107/S1600536812026931/hb6849Isup3.cml Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C18H17N5OSF(000) = 736
Mr = 351.43Dx = 1.378 Mg m3
Monoclinic, P21/nMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ynCell parameters from 5058 reflections
a = 8.8280 (1) Åθ = 2.3–32.4°
b = 10.8519 (2) ŵ = 0.21 mm1
c = 17.7353 (2) ÅT = 100 K
β = 94.379 (1)°Block, pink
V = 1694.09 (4) Å30.29 × 0.27 × 0.22 mm
Z = 4
Bruker SMART APEXII CCD diffractometer4948 independent reflections
Radiation source: fine-focus sealed tube3879 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.042
φ and ω scansθmax = 30.0°, θmin = 2.2°
Absorption correction: multi-scan (SADABS; Bruker, 2009)h = −12→12
Tmin = 0.942, Tmax = 0.955k = −15→15
18467 measured reflectionsl = −22→24
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.046Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.113H atoms treated by a mixture of independent and constrained refinement
S = 1.06w = 1/[σ2(Fo2) + (0.0482P)2 + 0.7836P] where P = (Fo2 + 2Fc2)/3
4948 reflections(Δ/σ)max = 0.001
294 parametersΔρmax = 0.43 e Å3
216 restraintsΔρmin = −0.26 e Å3
Experimental. The crystal was placed in the cold stream of an Oxford Cryosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 100.0 (1) K.
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > 2sigma(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.
xyzUiso*/UeqOcc. (<1)
S11.02274 (4)0.97510 (4)1.12626 (2)0.01906 (10)
O10.32416 (12)0.80260 (10)1.01785 (6)0.0171 (2)
N10.75067 (17)0.87882 (14)1.14880 (8)0.0208 (3)
N20.78833 (15)0.93939 (12)1.02818 (7)0.0168 (3)
N30.64788 (14)0.89082 (12)1.00657 (7)0.0169 (3)
N40.24554 (14)0.73854 (11)0.89336 (7)0.0153 (2)
N50.29680 (15)0.73976 (12)0.82182 (7)0.0182 (3)
C10.84379 (17)0.92800 (13)1.10068 (8)0.0160 (3)
C20.61467 (17)0.88237 (14)0.93528 (9)0.0179 (3)
H2A0.68400.91270.90130.022*
C30.47312 (17)0.82734 (14)0.90555 (8)0.0163 (3)
C40.35025 (17)0.78988 (13)0.94386 (8)0.0151 (3)
C50.43228 (18)0.79306 (14)0.82963 (8)0.0183 (3)
C60.40260 (17)0.72594 (14)1.07080 (8)0.0155 (3)
C70.50846 (17)0.63938 (14)1.05158 (8)0.0167 (3)
H7A0.53060.62881.00040.020*
C80.58163 (19)0.56845 (15)1.10841 (9)0.0207 (3)
H8A0.65480.50901.09610.025*
C90.5488 (2)0.58360 (16)1.18318 (9)0.0250 (4)
H9A0.59940.53501.22190.030*
C100.4411 (2)0.67053 (17)1.20104 (9)0.0269 (4)
H10A0.41800.68071.25210.032*
C110.36739 (19)0.74238 (16)1.14485 (9)0.0219 (3)
H11A0.29410.80181.15700.026*
C120.1022 (18)0.687 (2)0.9077 (9)0.0163 (15)0.50 (2)
C130.0307 (13)0.7157 (11)0.9729 (7)0.0168 (12)0.50 (2)
H13A0.07430.77401.00820.020*0.50 (2)
C14−0.1050 (15)0.6578 (12)0.9854 (7)0.0217 (13)0.50 (2)
H14A−0.15260.67481.03050.026*0.50 (2)
C15−0.1725 (12)0.5757 (10)0.9335 (7)0.0263 (15)0.50 (2)
H15A−0.26560.53680.94310.032*0.50 (2)
C16−0.1035 (11)0.5501 (10)0.8673 (6)0.0301 (15)0.50 (2)
H16A−0.15150.49660.83040.036*0.50 (2)
C170.0365 (12)0.6033 (10)0.8553 (6)0.0248 (15)0.50 (2)
H17A0.08690.58250.81160.030*0.50 (2)
C12X0.0983 (19)0.683 (2)0.9013 (9)0.0186 (16)0.50 (2)
C13X0.0278 (15)0.6967 (13)0.9686 (8)0.0259 (17)0.50 (2)
H13B0.07630.74091.00990.031*0.50 (2)
C14X−0.1156 (15)0.6440 (14)0.9742 (8)0.0276 (16)0.50 (2)
H14B−0.16360.65021.02020.033*0.50 (2)
C15X−0.1871 (12)0.5835 (11)0.9137 (7)0.0286 (15)0.50 (2)
H15B−0.28460.54810.91770.034*0.50 (2)
C16X−0.1171 (11)0.5744 (9)0.8473 (7)0.0304 (14)0.50 (2)
H16B−0.16810.53380.80520.036*0.50 (2)
C17X0.0263 (12)0.6231 (11)0.8405 (6)0.0244 (15)0.50 (2)
H17B0.07410.61500.79460.029*0.50 (2)
C180.5243 (2)0.80836 (19)0.76296 (10)0.0300 (4)
H18A0.45740.83160.71860.045*
H18B0.57540.73050.75290.045*
H18C0.60040.87300.77360.045*
H2N10.669 (2)0.8510 (18)1.1330 (11)0.025 (5)*
H1N10.781 (2)0.8649 (19)1.1957 (12)0.030 (5)*
H1N20.850 (2)0.9640 (19)0.9934 (12)0.032 (6)*
U11U22U33U12U13U23
S10.01562 (19)0.0281 (2)0.01348 (17)−0.00380 (15)0.00110 (13)−0.00271 (14)
O10.0174 (5)0.0224 (5)0.0119 (5)0.0045 (4)0.0031 (4)0.0019 (4)
N10.0161 (7)0.0320 (8)0.0139 (6)−0.0047 (6)−0.0007 (5)0.0019 (5)
N20.0146 (6)0.0214 (6)0.0144 (6)−0.0043 (5)0.0004 (5)0.0009 (5)
N30.0129 (6)0.0199 (6)0.0177 (6)−0.0019 (5)−0.0005 (5)0.0006 (5)
N40.0130 (6)0.0199 (6)0.0133 (6)−0.0011 (5)0.0022 (5)0.0012 (5)
N50.0162 (6)0.0260 (7)0.0125 (6)−0.0030 (5)0.0020 (5)0.0012 (5)
C10.0166 (7)0.0167 (7)0.0147 (7)0.0011 (6)0.0020 (5)−0.0023 (5)
C20.0147 (7)0.0230 (7)0.0164 (7)−0.0027 (6)0.0033 (6)0.0012 (6)
C30.0150 (7)0.0209 (7)0.0129 (6)−0.0018 (6)−0.0002 (5)0.0023 (5)
C40.0143 (7)0.0176 (7)0.0136 (6)0.0018 (5)0.0012 (5)0.0020 (5)
C50.0164 (7)0.0234 (7)0.0149 (7)−0.0034 (6)0.0008 (6)0.0021 (6)
C60.0149 (7)0.0183 (7)0.0135 (6)−0.0019 (5)0.0020 (5)0.0035 (5)
C70.0165 (7)0.0194 (7)0.0148 (7)−0.0020 (6)0.0039 (6)0.0013 (5)
C80.0187 (8)0.0206 (7)0.0229 (8)0.0009 (6)0.0024 (6)0.0039 (6)
C90.0234 (8)0.0315 (9)0.0200 (8)0.0017 (7)0.0005 (6)0.0102 (7)
C100.0271 (9)0.0397 (10)0.0146 (7)0.0023 (7)0.0054 (6)0.0069 (7)
C110.0204 (8)0.0300 (8)0.0160 (7)0.0036 (7)0.0062 (6)0.0018 (6)
C120.011 (2)0.016 (2)0.021 (3)−0.001 (2)−0.003 (2)−0.002 (2)
C130.013 (2)0.013 (3)0.026 (2)−0.0041 (17)0.0103 (18)−0.0068 (17)
C140.020 (2)0.016 (2)0.030 (3)−0.0049 (17)0.006 (2)−0.0092 (19)
C150.020 (3)0.023 (2)0.038 (3)−0.0064 (19)0.015 (3)−0.009 (3)
C160.023 (2)0.031 (3)0.038 (3)−0.014 (2)0.007 (2)−0.012 (2)
C170.020 (2)0.029 (3)0.026 (3)−0.004 (2)0.010 (2)−0.007 (2)
C12X0.011 (3)0.021 (3)0.025 (3)−0.001 (2)0.008 (3)0.003 (2)
C13X0.025 (2)0.024 (4)0.028 (3)−0.004 (2)−0.001 (2)−0.003 (2)
C14X0.018 (3)0.031 (4)0.035 (3)−0.005 (2)0.013 (3)−0.003 (3)
C15X0.016 (2)0.031 (2)0.040 (4)−0.0073 (18)0.007 (3)−0.006 (3)
C16X0.024 (2)0.031 (3)0.036 (3)−0.006 (2)0.009 (2)−0.011 (2)
C17X0.017 (2)0.030 (3)0.026 (3)−0.007 (2)0.004 (2)−0.005 (2)
C180.0265 (9)0.0471 (11)0.0170 (8)−0.0129 (8)0.0061 (7)0.0001 (7)
S1—C11.6892 (16)C10—C111.388 (2)
O1—C41.3566 (17)C10—H10A0.9500
O1—C61.3979 (17)C11—H11A0.9500
N1—C11.340 (2)C12—C131.395 (9)
N1—H2N10.81 (2)C12—C171.395 (10)
N1—H1N10.87 (2)C13—C141.385 (9)
N2—C11.3461 (19)C13—H13A0.9500
N2—N31.3746 (18)C14—C151.382 (8)
N2—H1N20.89 (2)C14—H14A0.9500
N3—C21.2792 (19)C15—C161.393 (8)
N4—C41.3567 (19)C15—H15A0.9500
N4—N51.3793 (17)C16—C171.395 (8)
N4—C121.423 (13)C16—H16A0.9500
N4—C12X1.447 (12)C17—H17A0.9500
N5—C51.326 (2)C12X—C17X1.375 (10)
C2—C31.448 (2)C12X—C13X1.395 (10)
C2—H2A0.9500C13X—C14X1.400 (9)
C3—C41.384 (2)C13X—H13B0.9500
C3—C51.417 (2)C14X—C15X1.370 (8)
C5—C181.494 (2)C14X—H14B0.9500
C6—C111.384 (2)C15X—C16X1.375 (8)
C6—C71.386 (2)C15X—H15B0.9500
C7—C81.388 (2)C16X—C17X1.386 (9)
C7—H7A0.9500C16X—H16B0.9500
C8—C91.389 (2)C17X—H17B0.9500
C8—H8A0.9500C18—H18A0.9800
C9—C101.393 (2)C18—H18B0.9800
C9—H9A0.9500C18—H18C0.9800
C4—O1—C6118.51 (11)C6—C11—C10118.82 (15)
C1—N1—H2N1119.9 (14)C6—C11—H11A120.6
C1—N1—H1N1121.4 (14)C10—C11—H11A120.6
H2N1—N1—H1N1118 (2)C13—C12—C17120.4 (9)
C1—N2—N3119.05 (13)C13—C12—N4121.8 (8)
C1—N2—H1N2119.5 (14)C17—C12—N4117.8 (9)
N3—N2—H1N2120.2 (14)C14—C13—C12118.9 (8)
C2—N3—N2115.90 (13)C14—C13—H13A120.6
C4—N4—N5110.39 (12)C12—C13—H13A120.6
C4—N4—C12127.8 (6)C15—C14—C13121.4 (8)
N5—N4—C12121.8 (5)C15—C14—H14A119.3
C4—N4—C12X132.6 (6)C13—C14—H14A119.3
N5—N4—C12X117.0 (6)C14—C15—C16119.7 (8)
C12—N4—C12X4.8 (10)C14—C15—H15A120.1
C5—N5—N4105.35 (12)C16—C15—H15A120.1
N1—C1—N2116.66 (14)C15—C16—C17119.7 (7)
N1—C1—S1123.78 (12)C15—C16—H16A120.1
N2—C1—S1119.56 (12)C17—C16—H16A120.1
N3—C2—C3121.06 (14)C16—C17—C12119.8 (8)
N3—C2—H2A119.5C16—C17—H17A120.1
C3—C2—H2A119.5C12—C17—H17A120.1
C4—C3—C5103.72 (13)C17X—C12X—C13X120.6 (10)
C4—C3—C2129.01 (14)C17X—C12X—N4119.1 (9)
C5—C3—C2127.19 (14)C13X—C12X—N4120.3 (9)
O1—C4—N4121.53 (13)C12X—C13X—C14X119.0 (9)
O1—C4—C3129.96 (14)C12X—C13X—H13B120.5
N4—C4—C3108.46 (13)C14X—C13X—H13B120.5
N5—C5—C3112.08 (14)C15X—C14X—C13X120.3 (9)
N5—C5—C18120.41 (14)C15X—C14X—H14B119.8
C3—C5—C18127.50 (14)C13X—C14X—H14B119.8
C11—C6—C7121.69 (14)C14X—C15X—C16X119.7 (8)
C11—C6—O1115.15 (13)C14X—C15X—H15B120.1
C7—C6—O1123.15 (13)C16X—C15X—H15B120.1
C6—C7—C8118.85 (14)C15X—C16X—C17X121.3 (7)
C6—C7—H7A120.6C15X—C16X—H16B119.4
C8—C7—H7A120.6C17X—C16X—H16B119.4
C7—C8—C9120.55 (15)C12X—C17X—C16X119.0 (8)
C7—C8—H8A119.7C12X—C17X—H17B120.5
C9—C8—H8A119.7C16X—C17X—H17B120.5
C8—C9—C10119.56 (15)C5—C18—H18A109.5
C8—C9—H9A120.2C5—C18—H18B109.5
C10—C9—H9A120.2H18A—C18—H18B109.5
C11—C10—C9120.53 (15)C5—C18—H18C109.5
C11—C10—H10A119.7H18A—C18—H18C109.5
C9—C10—H10A119.7H18B—C18—H18C109.5
C1—N2—N3—C2−166.48 (14)C8—C9—C10—C11−0.4 (3)
C4—N4—N5—C5−0.51 (16)C7—C6—C11—C100.4 (2)
C12—N4—N5—C5−179.7 (12)O1—C6—C11—C10−179.52 (15)
C12X—N4—N5—C5−179.4 (12)C9—C10—C11—C60.1 (3)
N3—N2—C1—N1−5.8 (2)C4—N4—C12—C1320 (3)
N3—N2—C1—S1174.23 (10)N5—N4—C12—C13−161.4 (14)
N2—N3—C2—C3177.04 (13)C12X—N4—C12—C13−164 (27)
N3—C2—C3—C47.7 (3)C4—N4—C12—C17−158.3 (11)
N3—C2—C3—C5−168.53 (16)N5—N4—C12—C1721 (2)
C6—O1—C4—N4107.65 (16)C12X—N4—C12—C1718 (23)
C6—O1—C4—C3−75.5 (2)C17—C12—C13—C141 (3)
N5—N4—C4—O1178.07 (12)N4—C12—C13—C14−176.7 (16)
C12—N4—C4—O1−2.8 (13)C12—C13—C14—C15−2 (2)
C12X—N4—C4—O1−3.3 (14)C13—C14—C15—C160.0 (18)
N5—N4—C4—C30.62 (17)C14—C15—C16—C172.8 (13)
C12—N4—C4—C3179.7 (13)C15—C16—C17—C12−3.7 (16)
C12X—N4—C4—C3179.3 (14)C13—C12—C17—C162 (3)
C5—C3—C4—O1−177.63 (15)N4—C12—C17—C16179.6 (13)
C2—C3—C4—O15.5 (3)C4—N4—C12X—C17X−171.0 (11)
C5—C3—C4—N4−0.45 (16)N5—N4—C12X—C17X8 (2)
C2—C3—C4—N4−177.34 (15)C12—N4—C12X—C17X−175 (27)
N4—N5—C5—C30.21 (17)C4—N4—C12X—C13X12 (3)
N4—N5—C5—C18178.89 (15)N5—N4—C12X—C13X−169.3 (15)
C4—C3—C5—N50.15 (18)C12—N4—C12X—C13X8 (23)
C2—C3—C5—N5177.11 (15)C17X—C12X—C13X—C14X2 (3)
C4—C3—C5—C18−178.41 (16)N4—C12X—C13X—C14X179.0 (16)
C2—C3—C5—C18−1.5 (3)C12X—C13X—C14X—C15X−2 (2)
C4—O1—C6—C11−178.56 (14)C13X—C14X—C15X—C16X0.2 (19)
C4—O1—C6—C71.5 (2)C14X—C15X—C16X—C17X1.3 (14)
C11—C6—C7—C8−0.6 (2)C13X—C12X—C17X—C16X−1 (3)
O1—C6—C7—C8179.31 (14)N4—C12X—C17X—C16X−177.6 (14)
C6—C7—C8—C90.3 (2)C15X—C16X—C17X—C12X−1.0 (17)
C7—C8—C9—C100.2 (3)
D—H···AD—HH···AD···AD—H···A
N1—H1N1···N5i0.87 (2)2.50 (2)3.3237 (19)158.1 (18)
N2—H1N2···S1ii0.89 (2)2.56 (2)3.4414 (13)167.7 (17)
C13—H13A···O10.952.222.814 (12)120
C13—H13B···O10.792.282.814 (12)125
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯A D—HH⋯A DA D—H⋯A
N1—H1N1⋯N5i 0.87 (2)2.50 (2)3.3237 (19)158.1 (18)
N2—H1N2⋯S1ii 0.89 (2)2.56 (2)3.4414 (13)167.7 (17)
C13—H13A⋯O10.952.222.814 (12)120
C13—H13B⋯O10.792.282.814 (12)125

Symmetry codes: (i) ; (ii) .

  8 in total

1.  A short history of SHELX.

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

2.  Regioselective reaction: synthesis, characterization and pharmacological studies of some new Mannich bases derived from 1,2,4-triazoles.

Authors:  Arun M Isloor; Balakrishna Kalluraya; Prashanth Shetty
Journal:  Eur J Med Chem       Date:  2009-05-05       Impact factor: 6.514

3.  Synthesis and pharmacological study of 1-acetyl/propyl-3-aryl-5-(5-chloro-3-methyl-1-phenyl-1H-pyrazol-4-yl)-2-pyrazoline.

Authors:  K S Girisha; Balakrishna Kalluraya; Vijaya Narayana
Journal:  Eur J Med Chem       Date:  2010-07-24       Impact factor: 6.514

4.  Convenient access to 1,3,4-trisubstituted pyrazoles carrying 5-nitrothiophene moiety via 1,3-dipolar cycloaddition of sydnones with acetylenic ketones and their antimicrobial evaluation.

Authors:  N Satheesha Rai; Balakrishna Kalluraya; B Lingappa; Shaliny Shenoy; Vedavati G Puranic
Journal:  Eur J Med Chem       Date:  2007-08-30       Impact factor: 6.514

5.  (E)-3-[3-(4-Bromo-phen-yl)-1-phenyl-1H-pyrazol-4-yl]-1-(2,4-dichloro-phen-yl)prop-2-en-1-one.

Authors:  Hoong-Kun Fun; Ching Kheng Quah; Shridhar Malladi; Arun M Isloor; Kammasandra N Shivananda
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2011-10-29

6.  (E)-1-(2,4-Dichloro-phen-yl)-3-(1,3-diphenyl-1H-pyrazol-4-yl)prop-2-en-1-one.

Authors:  Hoong-Kun Fun; Ching Kheng Quah; Shridhar Malladi; Arun M Isloor; Kammasandra N Shivananda
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2011-10-29

7.  (E)-1-(2,4-Dichloro-phen-yl)-3-[3-(4-meth-oxy-phen-yl)-1-phenyl-1H-pyrazol-4-yl]prop-2-en-1-one.

Authors:  Hoong-Kun Fun; Ching Kheng Quah; Shridhar Malladi; Raghavendra Hebbar; Arun M Isloor
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2011-10-29

8.  Structure validation in chemical crystallography.

Authors:  Anthony L Spek
Journal:  Acta Crystallogr D Biol Crystallogr       Date:  2009-01-20
  8 in total

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