Literature DB >> 22969648

N-(2-{[5-Bromo-2-(piperidin-1-yl)pyrimidin-4-yl]sulfan-yl}-4-meth-oxy-phen-yl)-2,4,6-trimethyl-benzene-sulfonamide.

Mohan Kumar, L Mallesha, M A Sridhar, Kamini Kapoor, Vivek K Gupta, Rajni Kant.   

Abstract

In the title compound, C(25)H(29)BrN(4)O(3)S(2), the benzene rings bridged by the sulfonamide group are tilted relative to each other by 63.9 (1)° and the dihedral angle between the sulfur-bridged pyrimidine and benzene rings is 64.9 (1)°. The mol-ecular conformation is stabilized by a weak intra-molecular π-π stacking inter-action between the pyrimidine and the 2,4,6-trimethyl-benzene rings [centroid-centroid distance = 3.766 (2) Å]. The piperidine ring adopts a chair conformation. In the crystal, mol-ecules are linked into inversion dimers by pairs of N-H⋯O hydrogen bonds and these dimers are further linked by C-H⋯O hydrogen bonds into chains propagating along [010].

Entities:  

Year:  2012        PMID: 22969648      PMCID: PMC3435802          DOI: 10.1107/S1600536812036185

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


Related literature

For the crystal structures of related sulfonamides, see: Rodrigues et al. (2011 ▶); Akkurt et al. (2011 ▶); Kant et al. (2012 ▶).

Experimental

Crystal data

C25H29BrN4O3S2 M = 577.55 Monoclinic, a = 9.3334 (5) Å b = 10.3635 (4) Å c = 27.8258 (11) Å β = 92.924 (4)° V = 2688.0 (2) Å3 Z = 4 Mo Kα radiation μ = 1.72 mm−1 T = 293 K 0.3 × 0.2 × 0.2 mm

Data collection

Oxford Diffraction Xcalibur Sapphire3 diffractometer Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2010 ▶) T min = 0.649, T max = 1.000 21429 measured reflections 5266 independent reflections 3580 reflections with I > 2σ(I) R int = 0.043

Refinement

R[F 2 > 2σ(F 2)] = 0.054 wR(F 2) = 0.123 S = 1.06 5266 reflections 320 parameters H-atom parameters constrained Δρmax = 0.35 e Å−3 Δρmin = −0.43 e Å−3 Data collection: CrysAlis PRO (Oxford Diffraction, 2010 ▶); cell refinement: CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: ORTEP-3 (Farrugia, 1997 ▶); software used to prepare material for publication: PLATON (Spek, 2009 ▶). Crystal structure: contains datablock(s) I, global. DOI: 10.1107/S1600536812036185/hb6940sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536812036185/hb6940Isup2.hkl Supplementary material file. DOI: 10.1107/S1600536812036185/hb6940Isup3.cml Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C25H29BrN4O3S2F(000) = 1192
Mr = 577.55Dx = 1.427 Mg m3
Monoclinic, P21/nMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ynCell parameters from 6963 reflections
a = 9.3334 (5) Åθ = 3.5–29.0°
b = 10.3635 (4) ŵ = 1.72 mm1
c = 27.8258 (11) ÅT = 293 K
β = 92.924 (4)°Block, white
V = 2688.0 (2) Å30.3 × 0.2 × 0.2 mm
Z = 4
Oxford Diffraction Xcalibur Sapphire3 diffractometer5266 independent reflections
Radiation source: fine-focus sealed tube3580 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.043
Detector resolution: 16.1049 pixels mm-1θmax = 26.0°, θmin = 3.5°
ω scanh = −11→11
Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2010)k = −12→12
Tmin = 0.649, Tmax = 1.000l = −34→34
21429 measured reflections
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.054Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.123H-atom parameters constrained
S = 1.06w = 1/[σ2(Fo2) + (0.0365P)2 + 2.6423P] where P = (Fo2 + 2Fc2)/3
5266 reflections(Δ/σ)max = 0.001
320 parametersΔρmax = 0.35 e Å3
0 restraintsΔρmin = −0.43 e Å3
Experimental. CrysAlis PRO, Oxford Diffraction Ltd., Version 1.171.34.40 (release 27–08-2010 CrysAlis171. NET) (compiled Aug 27 2010,11:50:40) Empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm.
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
Br10.24625 (5)1.11199 (4)0.216359 (17)0.07602 (19)
S10.19179 (12)0.85193 (11)0.00058 (3)0.0626 (3)
S20.10025 (10)0.89654 (9)0.14471 (3)0.0513 (3)
O10.2090 (4)0.7302 (3)−0.02194 (10)0.0849 (10)
O20.1541 (3)0.9599 (3)−0.02939 (9)0.0725 (9)
O3−0.0197 (3)0.4244 (3)0.15889 (9)0.0700 (8)
N10.0612 (4)0.8411 (3)0.03700 (10)0.0628 (9)
H10.00050.90350.03740.075*
N40.5272 (3)0.8077 (3)0.21918 (12)0.0604 (9)
N50.3329 (3)0.7523 (3)0.16362 (10)0.0453 (7)
N70.5265 (4)0.6181 (3)0.17624 (14)0.0733 (10)
C10.3494 (4)0.8878 (4)0.03643 (12)0.0523 (9)
C20.3591 (4)1.0096 (4)0.05852 (13)0.0518 (9)
C30.4791 (4)1.0346 (4)0.08927 (14)0.0612 (11)
H30.48561.11450.10450.073*
C40.5867 (5)0.9480 (5)0.09806 (14)0.0646 (12)
C50.5758 (5)0.8317 (5)0.07489 (15)0.0699 (12)
H50.64980.77250.08010.084*
C60.4601 (5)0.7970 (4)0.04384 (15)0.0652 (11)
C70.2507 (5)1.1154 (4)0.05177 (17)0.0712 (12)
H7A0.25151.14740.01940.107*
H7B0.27401.18420.07390.107*
H7C0.15711.08250.05760.107*
C80.7134 (5)0.9787 (6)0.13240 (16)0.0922 (17)
H8A0.78731.01960.11510.138*
H8B0.74990.90020.14670.138*
H8C0.68321.03560.15720.138*
C90.0417 (4)0.7345 (4)0.06810 (12)0.0555 (10)
C10−0.0028 (6)0.6177 (5)0.04949 (15)0.0934 (18)
H10−0.02000.61000.01640.112*
C11−0.0228 (6)0.5119 (5)0.07801 (15)0.0879 (17)
H11−0.05060.43350.06420.106*
C12−0.0016 (4)0.5222 (4)0.12717 (13)0.0549 (10)
C130.0332 (4)0.6404 (4)0.14644 (12)0.0500 (9)
H130.04040.64970.17970.060*
C140.0579 (4)0.7461 (4)0.11776 (12)0.0449 (8)
C15−0.0514 (6)0.2991 (4)0.14117 (17)0.0791 (14)
H15A−0.13760.30180.12090.119*
H15B−0.06450.24180.16770.119*
H15C0.02650.26890.12290.119*
C160.2696 (4)0.8624 (3)0.17246 (11)0.0406 (8)
C170.3325 (4)0.9525 (3)0.20396 (12)0.0466 (9)
C180.4616 (4)0.7291 (4)0.18658 (13)0.0504 (9)
C210.4617 (4)0.9181 (4)0.22662 (13)0.0580 (10)
H210.50510.97600.24840.070*
C220.6581 (5)0.5732 (5)0.2017 (2)0.0938 (16)
H22A0.69400.63960.22370.113*
H22B0.73060.55660.17870.113*
C230.6303 (6)0.4531 (6)0.2290 (2)0.110 (2)
H23A0.56890.47320.25510.131*
H23B0.72040.42060.24310.131*
C240.5602 (7)0.3496 (6)0.1980 (3)0.124 (2)
H24A0.53360.27760.21790.148*
H24B0.62750.31830.17520.148*
C250.4283 (6)0.4025 (5)0.1711 (2)0.1031 (19)
H25A0.38980.33770.14880.124*
H25B0.35560.42140.19380.124*
C260.4612 (6)0.5222 (5)0.14396 (18)0.0857 (15)
H26A0.52610.50190.11890.103*
H26B0.37350.55670.12880.103*
C270.4663 (7)0.6661 (5)0.0203 (2)0.113 (2)
H27A0.55490.62440.03000.169*
H27B0.46060.6762−0.01410.169*
H27C0.38730.61440.02990.169*
U11U22U33U12U13U23
Br10.0919 (4)0.0579 (3)0.0777 (3)−0.0032 (2)−0.0005 (3)−0.0240 (2)
S10.0804 (8)0.0720 (7)0.0346 (5)−0.0331 (6)−0.0047 (5)0.0008 (5)
S20.0549 (6)0.0503 (5)0.0476 (5)−0.0009 (5)−0.0081 (4)−0.0051 (4)
O10.117 (3)0.085 (2)0.0528 (17)−0.039 (2)−0.0007 (17)−0.0228 (16)
O20.077 (2)0.095 (2)0.0442 (15)−0.0272 (17)−0.0060 (14)0.0220 (15)
O30.103 (2)0.0584 (17)0.0485 (15)−0.0251 (16)0.0001 (15)0.0052 (14)
N10.069 (2)0.077 (2)0.0421 (17)−0.0288 (19)−0.0059 (15)0.0138 (17)
N40.055 (2)0.067 (2)0.058 (2)−0.0087 (18)−0.0134 (16)−0.0050 (18)
N50.0479 (18)0.0480 (18)0.0394 (16)−0.0064 (14)−0.0029 (13)−0.0011 (14)
N70.067 (2)0.062 (2)0.088 (3)0.0127 (19)−0.018 (2)−0.008 (2)
C10.063 (2)0.055 (2)0.0388 (19)−0.016 (2)0.0010 (17)−0.0008 (18)
C20.051 (2)0.059 (2)0.046 (2)−0.013 (2)0.0029 (17)0.0005 (19)
C30.061 (3)0.073 (3)0.049 (2)−0.024 (2)0.003 (2)−0.009 (2)
C40.052 (3)0.099 (4)0.043 (2)−0.016 (3)0.0038 (19)0.008 (2)
C50.060 (3)0.089 (3)0.061 (3)0.007 (3)0.008 (2)0.016 (3)
C60.080 (3)0.062 (3)0.054 (2)−0.008 (2)0.010 (2)−0.003 (2)
C70.075 (3)0.061 (3)0.077 (3)−0.009 (2)−0.004 (2)−0.013 (2)
C80.058 (3)0.154 (5)0.063 (3)−0.027 (3)−0.008 (2)0.016 (3)
C90.067 (3)0.063 (2)0.0353 (19)−0.032 (2)−0.0038 (17)0.0024 (18)
C100.156 (5)0.090 (4)0.034 (2)−0.069 (4)0.004 (3)−0.008 (2)
C110.146 (5)0.075 (3)0.043 (2)−0.061 (3)0.013 (3)−0.012 (2)
C120.067 (3)0.057 (2)0.041 (2)−0.023 (2)0.0038 (18)0.0000 (19)
C130.054 (2)0.064 (3)0.0313 (18)−0.0146 (19)−0.0020 (16)−0.0010 (18)
C140.043 (2)0.055 (2)0.0353 (18)−0.0125 (17)−0.0051 (15)−0.0019 (17)
C150.102 (4)0.052 (3)0.083 (3)−0.015 (3)0.005 (3)0.000 (2)
C160.048 (2)0.045 (2)0.0282 (16)−0.0126 (17)0.0002 (14)0.0024 (15)
C170.055 (2)0.048 (2)0.0370 (19)−0.0115 (18)0.0042 (17)−0.0042 (16)
C180.051 (2)0.054 (2)0.046 (2)−0.0048 (19)−0.0029 (18)0.0033 (18)
C210.065 (3)0.064 (3)0.045 (2)−0.019 (2)−0.0068 (19)−0.009 (2)
C220.058 (3)0.093 (4)0.129 (5)0.014 (3)−0.007 (3)0.003 (4)
C230.064 (3)0.132 (5)0.131 (5)0.015 (3)−0.015 (3)0.053 (4)
C240.085 (4)0.083 (4)0.200 (7)−0.002 (3)−0.019 (4)0.042 (5)
C250.088 (4)0.073 (3)0.145 (5)−0.006 (3)−0.022 (4)0.006 (4)
C260.099 (4)0.072 (3)0.085 (3)0.023 (3)−0.010 (3)−0.016 (3)
C270.159 (6)0.076 (4)0.102 (4)0.015 (4)−0.002 (4)−0.023 (3)
Br1—C171.878 (4)C8—H8C0.9600
S1—O11.422 (3)C9—C101.373 (5)
S1—O21.429 (3)C9—C141.388 (5)
S1—N11.628 (3)C10—C111.372 (6)
S1—C11.774 (4)C10—H100.9300
S2—C161.760 (4)C11—C121.376 (5)
S2—C141.766 (4)C11—H110.9300
O3—C121.360 (4)C12—C131.369 (5)
O3—C151.415 (5)C13—C141.382 (5)
N1—C91.420 (5)C13—H130.9300
N1—H10.8600C15—H15A0.9600
N4—C211.319 (5)C15—H15B0.9600
N4—C181.343 (5)C15—H15C0.9600
N5—C161.313 (4)C16—C171.390 (4)
N5—C181.353 (4)C17—C211.379 (5)
N7—C181.339 (5)C21—H210.9300
N7—C261.452 (6)C22—C231.488 (7)
N7—C221.461 (6)C22—H22A0.9700
C1—C21.405 (5)C22—H22B0.9700
C1—C61.405 (6)C23—C241.505 (8)
C2—C31.398 (5)C23—H23A0.9700
C2—C71.497 (6)C23—H23B0.9700
C3—C41.360 (6)C24—C251.511 (7)
C3—H30.9300C24—H24A0.9700
C4—C51.368 (6)C24—H24B0.9700
C4—C81.516 (6)C25—C261.493 (7)
C5—C61.395 (6)C25—H25A0.9700
C5—H50.9300C25—H25B0.9700
C6—C271.509 (6)C26—H26A0.9700
C7—H7A0.9600C26—H26B0.9700
C7—H7B0.9600C27—H27A0.9600
C7—H7C0.9600C27—H27B0.9600
C8—H8A0.9600C27—H27C0.9600
C8—H8B0.9600
O1—S1—O2117.88 (18)C12—C13—H13119.1
O1—S1—N1108.56 (19)C14—C13—H13119.1
O2—S1—N1104.34 (19)C13—C14—C9119.6 (3)
O1—S1—C1108.9 (2)C13—C14—S2119.7 (3)
O2—S1—C1109.66 (17)C9—C14—S2120.7 (3)
N1—S1—C1106.87 (16)O3—C15—H15A109.5
C16—S2—C14100.67 (17)O3—C15—H15B109.5
C12—O3—C15119.2 (3)H15A—C15—H15B109.5
C9—N1—S1123.8 (3)O3—C15—H15C109.5
C9—N1—H1118.1H15A—C15—H15C109.5
S1—N1—H1118.1H15B—C15—H15C109.5
C21—N4—C18115.7 (3)N5—C16—C17121.5 (3)
C16—N5—C18117.5 (3)N5—C16—S2119.7 (2)
C18—N7—C26122.7 (4)C17—C16—S2118.8 (3)
C18—N7—C22123.2 (4)C21—C17—C16116.4 (3)
C26—N7—C22113.4 (4)C21—C17—Br1121.1 (3)
C2—C1—C6120.5 (4)C16—C17—Br1122.4 (3)
C2—C1—S1117.9 (3)N7—C18—N4118.1 (4)
C6—C1—S1121.6 (3)N7—C18—N5116.9 (3)
C3—C2—C1117.8 (4)N4—C18—N5125.1 (4)
C3—C2—C7117.1 (4)N4—C21—C17123.7 (3)
C1—C2—C7125.1 (3)N4—C21—H21118.2
C4—C3—C2123.3 (4)C17—C21—H21118.2
C4—C3—H3118.4N7—C22—C23110.5 (4)
C2—C3—H3118.4N7—C22—H22A109.6
C3—C4—C5117.4 (4)C23—C22—H22A109.6
C3—C4—C8121.4 (5)N7—C22—H22B109.6
C5—C4—C8121.2 (5)C23—C22—H22B109.6
C4—C5—C6123.7 (4)H22A—C22—H22B108.1
C4—C5—H5118.1C22—C23—C24112.6 (5)
C6—C5—H5118.1C22—C23—H23A109.1
C5—C6—C1117.3 (4)C24—C23—H23A109.1
C5—C6—C27117.1 (5)C22—C23—H23B109.1
C1—C6—C27125.6 (4)C24—C23—H23B109.1
C2—C7—H7A109.5H23A—C23—H23B107.8
C2—C7—H7B109.5C23—C24—C25110.1 (5)
H7A—C7—H7B109.5C23—C24—H24A109.6
C2—C7—H7C109.5C25—C24—H24A109.6
H7A—C7—H7C109.5C23—C24—H24B109.6
H7B—C7—H7C109.5C25—C24—H24B109.6
C4—C8—H8A109.5H24A—C24—H24B108.1
C4—C8—H8B109.5C26—C25—C24111.6 (5)
H8A—C8—H8B109.5C26—C25—H25A109.3
C4—C8—H8C109.5C24—C25—H25A109.3
H8A—C8—H8C109.5C26—C25—H25B109.3
H8B—C8—H8C109.5C24—C25—H25B109.3
C10—C9—C14117.9 (3)H25A—C25—H25B108.0
C10—C9—N1120.1 (3)N7—C26—C25110.3 (4)
C14—C9—N1121.9 (3)N7—C26—H26A109.6
C11—C10—C9122.3 (4)C25—C26—H26A109.6
C11—C10—H10118.9N7—C26—H26B109.6
C9—C10—H10118.9C25—C26—H26B109.6
C10—C11—C12119.7 (4)H26A—C26—H26B108.1
C10—C11—H11120.1C6—C27—H27A109.5
C12—C11—H11120.1C6—C27—H27B109.5
O3—C12—C13116.6 (3)H27A—C27—H27B109.5
O3—C12—C11124.8 (4)C6—C27—H27C109.5
C13—C12—C11118.6 (4)H27A—C27—H27C109.5
C12—C13—C14121.7 (3)H27B—C27—H27C109.5
O1—S1—N1—C942.9 (3)C12—C13—C14—C92.6 (6)
O2—S1—N1—C9169.4 (3)C12—C13—C14—S2179.2 (3)
C1—S1—N1—C9−74.5 (3)C10—C9—C14—C131.8 (6)
O1—S1—C1—C2174.6 (3)N1—C9—C14—C13177.9 (4)
O2—S1—C1—C244.2 (3)C10—C9—C14—S2−174.7 (4)
N1—S1—C1—C2−68.3 (3)N1—C9—C14—S21.4 (5)
O1—S1—C1—C6−7.1 (4)C16—S2—C14—C1367.1 (3)
O2—S1—C1—C6−137.5 (3)C16—S2—C14—C9−116.3 (3)
N1—S1—C1—C6110.0 (3)C18—N5—C16—C170.4 (5)
C6—C1—C2—C3−2.4 (5)C18—N5—C16—S2−178.6 (2)
S1—C1—C2—C3175.9 (3)C14—S2—C16—N58.3 (3)
C6—C1—C2—C7177.6 (4)C14—S2—C16—C17−170.8 (3)
S1—C1—C2—C7−4.1 (5)N5—C16—C17—C21−2.3 (5)
C1—C2—C3—C41.0 (6)S2—C16—C17—C21176.7 (3)
C7—C2—C3—C4−179.0 (4)N5—C16—C17—Br1178.8 (2)
C2—C3—C4—C50.8 (6)S2—C16—C17—Br1−2.2 (4)
C2—C3—C4—C8−178.9 (4)C26—N7—C18—N4175.9 (4)
C3—C4—C5—C6−1.3 (6)C22—N7—C18—N45.7 (6)
C8—C4—C5—C6178.4 (4)C26—N7—C18—N5−3.1 (6)
C4—C5—C6—C1−0.1 (6)C22—N7—C18—N5−173.3 (4)
C4—C5—C6—C27178.7 (4)C21—N4—C18—N7177.3 (4)
C2—C1—C6—C52.0 (6)C21—N4—C18—N5−3.7 (6)
S1—C1—C6—C5−176.3 (3)C16—N5—C18—N7−178.3 (3)
C2—C1—C6—C27−176.6 (4)C16—N5—C18—N42.8 (5)
S1—C1—C6—C275.1 (6)C18—N4—C21—C171.5 (6)
S1—N1—C9—C10−71.3 (5)C16—C17—C21—N41.3 (6)
S1—N1—C9—C14112.7 (4)Br1—C17—C21—N4−179.8 (3)
C14—C9—C10—C11−4.0 (8)C18—N7—C22—C23114.5 (5)
N1—C9—C10—C11179.8 (5)C26—N7—C22—C23−56.6 (6)
C9—C10—C11—C121.7 (9)N7—C22—C23—C2453.4 (7)
C15—O3—C12—C13−178.0 (4)C22—C23—C24—C25−52.3 (7)
C15—O3—C12—C115.4 (7)C23—C24—C25—C2653.1 (7)
C10—C11—C12—O3179.3 (5)C18—N7—C26—C25−113.2 (5)
C10—C11—C12—C132.8 (8)C22—N7—C26—C2557.9 (6)
O3—C12—C13—C14178.3 (3)C24—C25—C26—N7−55.7 (7)
C11—C12—C13—C14−5.0 (6)
D—H···AD—HH···AD···AD—H···A
N1—H1···O2i0.862.032.880 (5)172
C8—H8A···O2ii0.962.483.242 (5)136
C11—H11···O1iii0.932.503.387 (6)159
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯A D—HH⋯A DA D—H⋯A
N1—H1⋯O2i 0.862.032.880 (5)172
C8—H8A⋯O2ii 0.962.483.242 (5)136
C11—H11⋯O1iii 0.932.503.387 (6)159

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

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

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Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2010-12-18

3.  4-Chloro-N-(2,5-dimethyl-phen-yl)-2-methyl-benzene-sulfonamide.

Authors:  Vinola Z Rodrigues; Sabine Foro; B Thimme Gowda
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2011-10-08

4.  N-(2-{[5-Bromo-2-(morpholin-4-yl)pyrimidin-4-yl]sulfan-yl}-4-meth-oxy-phen-yl)-4-methyl-benzene-sulfonamide.

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Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2012-07-28

5.  Structure validation in chemical crystallography.

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