organic compounds\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890

(E)-4-Amino-N-(1,2-di­hydro­pyridin-2-yl­­idene)benzene­sulfonamide nitro­methane monosolvate

aMedicinal, Aromatic and Poisonous Plants Research Center (MAPPRC), College of Pharmacy, King Saud University, PO Box 2457, Riyadh 11451, Saudi Arabia, bDepartment of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, PO Box 2457, Riyadh 11451, Saudi Arabia, cCrystal Materials Research Unit, Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand, and dX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
*Correspondence e-mail: hkfun@usm.my

(Received 27 February 2012; accepted 6 March 2012; online 10 March 2012)

In the title solvate, C11H11N3O2S·CH3NO2, the dihedral angle between the benzene ring and the N-containing ring is 85.94 (11)°, and an approximate V shape arises for the sulfonamide mol­ecule. In the crystal, N—H⋯O and N—H⋯N hydrogen bonds and weak C—H⋯O inter­actions link the sulfonamide mol­ecules into a three-dimensional network. The nitro­methane solvent mol­ecules are located in the inter­stitial sites in the sulfonamide network.

Related literature

For background to the applications of sulfonamide compounds, see: Ghorab et al. (2009[Ghorab, M. M., Ragab, F. A., Alqasoumi, S. I., Alafeefy, A. M. & Aboulmaged, S. A. (2009). Eur. J. Med. Chem. 45, 171-178.]);

[Scheme 1]

Experimental

Crystal data
  • C11H11N3O2S·CH3NO2

  • Mr = 310.34

  • Orthorhombic, P b c a

  • a = 10.5179 (3) Å

  • b = 12.4857 (3) Å

  • c = 22.7237 (6) Å

  • V = 2984.15 (14) Å3

  • Z = 8

  • Cu Kα radiation

  • μ = 2.14 mm−1

  • T = 296 K

  • 0.54 × 0.43 × 0.31 mm

Data collection
  • Bruker SMART APEXII CCD diffractometer

  • Absorption correction: multi-scan (SADABS; Bruker, 2009[Bruker (2009). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.]) Tmin = 0.392, Tmax = 0.554

  • 14569 measured reflections

  • 2799 independent reflections

  • 2386 reflections with I > 2σ(I)

  • Rint = 0.062

Refinement
  • R[F2 > 2σ(F2)] = 0.045

  • wR(F2) = 0.144

  • S = 1.07

  • 2799 reflections

  • 196 parameters

  • H atoms treated by a mixture of independent and constrained refinement

  • Δρmax = 0.25 e Å−3

  • Δρmin = −0.42 e Å−3

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A D—H H⋯A DA D—H⋯A
N2—H1N2⋯O2i 0.87 2.10 2.971 (3) 174
N2—H2N2⋯O1ii 0.87 2.34 3.162 (3) 157
N3—H1N3⋯N1iii 0.86 (2) 2.09 (2) 2.948 (2) 178 (2)
C8—H8A⋯O1iii 0.93 2.52 3.160 (3) 126
Symmetry codes: (i) [-x, y-{\script{1\over 2}}, -z+{\script{1\over 2}}]; (ii) [-x-{\script{1\over 2}}, y-{\script{1\over 2}}, z]; (iii) -x, -y+1, -z.

Data collection: APEX2 (Bruker, 2009[Bruker (2009). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.]); cell refinement: SAINT (Bruker, 2009[Bruker (2009). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.]); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009[Spek, A. L. (2009). Acta Cryst. D65, 148-155.]).

Supporting information


Comment top

As part of our ongoing studies of sulfonamides with potential biological activities (Ghorab et al. (2009), the present investigation deals with the synthesis of the title compound, (I), (Fig. 1) a sulfonamide bearing a pyridine moiety to be evaluated as anticancer agent.

The environment of S atom is distorted tetrahedral geometry [angles around S atom are 104.49 (9) - 115.82 (10)°] with two O atoms, one N atom of the amide group and one C atom of the benzene ring. The dihedral angle between the benzene ring and the N atom-containing ring is 85.94 (11)°. The amino group is co-planar with its bound benzene ring with r.m.s. 0.0126 (2) Å for the seven non H atoms (C1–C6/N2).

In the crystal (Fig. 2), the molecules of sulfonamide derivative are linked by N—H···O and N—H···N hydrogen bonds and weak C···H···O interactions (Table 1) into a three dimensional network. The nitromethane solvent molecules are located in the interstitial sites of the sulfonamide network.

Related literature top

For background to the applications of sulfonamide compounds, see: Ghorab et al. (2009);

Experimental top

A mixture of (E)-3-(dimethylamino)-1-(thiophen-2-yl)prop-2-en-1-one (1.81 g, 0.01 mole) and sulfapyridine (2.49 g, 0.01 mole) in absolute ethanol (30 ml) was heated under reflux for 12 hr. The reaction mixture was filtered and pink blocks of (I) were obtained by the slow evaporation of an ethanol/nitromethane (3:1) solution at room temperature.

Refinement top

Amide H atom was located in a difference map and refined isotropically. The remaining H atoms were placed in calculated positions with d(N-H) = 0.87 Å, d(C-H) = 0.93 for aromatic, and 0.96 Å for CH3 atoms. The Uiso values were constrained to be 1.5Ueq of the carrier atom for methyl H atoms and 1.2Ueq for the remaining H atoms. A rotating group model was used for the methyl groups.

Structure description top

As part of our ongoing studies of sulfonamides with potential biological activities (Ghorab et al. (2009), the present investigation deals with the synthesis of the title compound, (I), (Fig. 1) a sulfonamide bearing a pyridine moiety to be evaluated as anticancer agent.

The environment of S atom is distorted tetrahedral geometry [angles around S atom are 104.49 (9) - 115.82 (10)°] with two O atoms, one N atom of the amide group and one C atom of the benzene ring. The dihedral angle between the benzene ring and the N atom-containing ring is 85.94 (11)°. The amino group is co-planar with its bound benzene ring with r.m.s. 0.0126 (2) Å for the seven non H atoms (C1–C6/N2).

In the crystal (Fig. 2), the molecules of sulfonamide derivative are linked by N—H···O and N—H···N hydrogen bonds and weak C···H···O interactions (Table 1) into a three dimensional network. The nitromethane solvent molecules are located in the interstitial sites of the sulfonamide network.

For background to the applications of sulfonamide compounds, see: Ghorab et al. (2009);

Computing details top

Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).

Figures top
[Figure 1] Fig. 1. The structure of (I), showing 30% probability displacement ellipsoids.
[Figure 2] Fig. 2. The crystal packing of (I) viewed along the a axis, showing three dimensional network.
(E)-4-Amino-N-(1,2-dihydropyridin-2-ylidene)benzenesulfonamide nitromethane monosolvate top
Crystal data top
C11H11N3O2S·CH3NO2F(000) = 1296
Mr = 310.34Dx = 1.381 Mg m3
Orthorhombic, PbcaCu Kα radiation, λ = 1.54178 Å
Hall symbol: -P 2ac 2abCell parameters from 2799 reflections
a = 10.5179 (3) Åθ = 5.7–71.6°
b = 12.4857 (3) ŵ = 2.14 mm1
c = 22.7237 (6) ÅT = 296 K
V = 2984.15 (14) Å3Block, pink
Z = 80.54 × 0.43 × 0.31 mm
Data collection top
Bruker SMART APEXII CCD
diffractometer
2799 independent reflections
Radiation source: fine-focus sealed tube2386 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.062
φ and ω scansθmax = 71.6°, θmin = 5.7°
Absorption correction: multi-scan
(SADABS; Bruker, 2009)
h = 1110
Tmin = 0.392, Tmax = 0.554k = 1515
14569 measured reflectionsl = 2727
Refinement top
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.045H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.144 w = 1/[σ2(Fo2) + (0.0843P)2 + 0.5181P]
where P = (Fo2 + 2Fc2)/3
S = 1.07(Δ/σ)max = 0.001
2799 reflectionsΔρmax = 0.25 e Å3
196 parametersΔρmin = 0.42 e Å3
0 restraintsExtinction correction: SHELXTL (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4
Primary atom site location: structure-invariant direct methodsExtinction coefficient: 0.0022 (3)
Crystal data top
C11H11N3O2S·CH3NO2V = 2984.15 (14) Å3
Mr = 310.34Z = 8
Orthorhombic, PbcaCu Kα radiation
a = 10.5179 (3) ŵ = 2.14 mm1
b = 12.4857 (3) ÅT = 296 K
c = 22.7237 (6) Å0.54 × 0.43 × 0.31 mm
Data collection top
Bruker SMART APEXII CCD
diffractometer
2799 independent reflections
Absorption correction: multi-scan
(SADABS; Bruker, 2009)
2386 reflections with I > 2σ(I)
Tmin = 0.392, Tmax = 0.554Rint = 0.062
14569 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0450 restraints
wR(F2) = 0.144H atoms treated by a mixture of independent and constrained refinement
S = 1.07Δρmax = 0.25 e Å3
2799 reflectionsΔρmin = 0.42 e Å3
196 parameters
Special details top

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
S10.03202 (5)0.52678 (4)0.13912 (2)0.0537 (2)
O10.04470 (16)0.62229 (11)0.13586 (7)0.0664 (4)
O20.14832 (16)0.53613 (12)0.17203 (7)0.0696 (4)
N10.05275 (16)0.49231 (13)0.07212 (8)0.0549 (4)
N20.27661 (19)0.18108 (17)0.24298 (10)0.0806 (6)
H1N20.24080.14170.26990.097*
H2N20.33640.15340.22130.097*
N30.13565 (17)0.39072 (14)0.00078 (8)0.0587 (4)
H1N30.082 (2)0.4266 (17)0.0216 (10)0.054 (6)*
C10.05963 (18)0.42658 (14)0.17206 (8)0.0499 (4)
C20.1786 (2)0.40208 (16)0.14851 (9)0.0547 (5)
H2A0.20930.44050.11650.066*
C30.2504 (2)0.32171 (17)0.17237 (9)0.0576 (5)
H3A0.32990.30630.15650.069*
C40.20549 (19)0.26212 (16)0.22053 (9)0.0567 (5)
C50.0891 (2)0.29027 (18)0.24482 (9)0.0628 (5)
H5A0.05990.25420.27800.075*
C60.0163 (2)0.37042 (17)0.22084 (9)0.0576 (5)
H6A0.06230.38710.23730.069*
C70.13465 (18)0.41433 (15)0.05728 (9)0.0530 (4)
C80.2136 (2)0.3168 (2)0.02582 (12)0.0741 (6)
H8A0.21040.30490.06620.089*
C90.2955 (3)0.2609 (2)0.00786 (14)0.0855 (8)
H9A0.34980.21060.00880.103*
C100.2968 (3)0.2799 (2)0.06752 (14)0.0857 (8)
H10A0.35230.24130.09130.103*
C110.2185 (2)0.35419 (18)0.09265 (11)0.0708 (6)
H11A0.22050.36510.13310.085*
O30.0798 (3)0.0856 (2)0.04675 (11)0.1239 (9)
O40.0699 (2)0.0317 (2)0.06434 (11)0.1120 (8)
N40.0045 (3)0.0378 (3)0.08153 (15)0.1093 (9)
C120.0102 (4)0.0684 (4)0.14512 (17)0.1265 (14)
H12A0.07220.09210.15780.190*
H12B0.07060.12530.15030.190*
H12C0.03580.00760.16810.190*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
S10.0566 (4)0.0492 (3)0.0551 (3)0.00291 (18)0.00473 (19)0.00030 (17)
O10.0793 (11)0.0487 (8)0.0712 (10)0.0061 (7)0.0029 (7)0.0001 (6)
O20.0653 (10)0.0710 (9)0.0724 (10)0.0133 (7)0.0152 (8)0.0063 (7)
N10.0541 (9)0.0559 (8)0.0546 (9)0.0045 (7)0.0008 (7)0.0066 (7)
N20.0624 (12)0.0869 (13)0.0923 (15)0.0077 (10)0.0068 (10)0.0371 (11)
N30.0544 (10)0.0631 (9)0.0587 (10)0.0083 (8)0.0006 (8)0.0047 (8)
C10.0513 (10)0.0518 (9)0.0464 (9)0.0002 (8)0.0059 (7)0.0004 (7)
C20.0549 (11)0.0588 (10)0.0505 (10)0.0017 (8)0.0082 (8)0.0071 (8)
C30.0479 (10)0.0659 (11)0.0589 (11)0.0003 (8)0.0077 (8)0.0038 (9)
C40.0494 (10)0.0626 (10)0.0580 (11)0.0039 (9)0.0040 (8)0.0082 (8)
C50.0618 (13)0.0740 (12)0.0525 (10)0.0043 (10)0.0075 (9)0.0153 (9)
C60.0546 (11)0.0663 (11)0.0518 (11)0.0017 (9)0.0110 (8)0.0050 (8)
C70.0476 (10)0.0520 (9)0.0595 (11)0.0021 (8)0.0016 (8)0.0072 (8)
C80.0688 (14)0.0791 (14)0.0744 (14)0.0156 (12)0.0052 (11)0.0043 (11)
C90.0784 (17)0.0795 (15)0.0985 (19)0.0293 (14)0.0006 (14)0.0035 (14)
C100.0832 (17)0.0737 (14)0.100 (2)0.0258 (13)0.0213 (15)0.0060 (13)
C110.0739 (15)0.0672 (12)0.0712 (14)0.0110 (11)0.0150 (11)0.0046 (10)
O30.1205 (18)0.148 (2)0.1029 (17)0.0638 (17)0.0212 (14)0.0115 (15)
O40.0996 (15)0.141 (2)0.0955 (15)0.0502 (15)0.0236 (13)0.0211 (13)
N40.0867 (17)0.139 (2)0.103 (2)0.0042 (17)0.0109 (16)0.0112 (17)
C120.122 (3)0.169 (4)0.089 (2)0.013 (3)0.004 (2)0.033 (2)
Geometric parameters (Å, º) top
S1—O21.4384 (16)C5—C61.373 (3)
S1—O11.4418 (15)C5—H5A0.9300
S1—N11.5971 (18)C6—H6A0.9300
S1—C11.7477 (19)C7—C111.410 (3)
N1—C71.343 (3)C8—C91.347 (4)
N2—C41.358 (3)C8—H8A0.9300
N2—H1N20.8700C9—C101.377 (4)
N2—H2N20.8699C9—H9A0.9300
N3—C71.352 (3)C10—C111.365 (4)
N3—C81.359 (3)C10—H10A0.9300
N3—H1N30.86 (2)C11—H11A0.9300
C1—C61.389 (3)O3—N41.268 (4)
C1—C21.395 (3)O4—N41.232 (4)
C2—C31.368 (3)N4—C121.496 (5)
C2—H2A0.9300C12—H12A0.9600
C3—C41.405 (3)C12—H12B0.9600
C3—H3A0.9300C12—H12C0.9600
C4—C51.388 (3)
O2—S1—O1115.82 (10)C5—C6—C1120.10 (19)
O2—S1—N1113.66 (10)C5—C6—H6A119.9
O1—S1—N1104.49 (9)C1—C6—H6A119.9
O2—S1—C1107.73 (10)N1—C7—N3114.09 (17)
O1—S1—C1107.78 (9)N1—C7—C11130.1 (2)
N1—S1—C1106.90 (9)N3—C7—C11115.81 (19)
C7—N1—S1121.49 (14)C9—C8—N3120.0 (2)
C4—N2—H1N2116.5C9—C8—H8A120.0
C4—N2—H2N2118.8N3—C8—H8A120.0
H1N2—N2—H2N2119.1C8—C9—C10118.4 (2)
C7—N3—C8124.15 (19)C8—C9—H9A120.8
C7—N3—H1N3114.7 (15)C10—C9—H9A120.8
C8—N3—H1N3121.1 (16)C11—C10—C9121.5 (2)
C6—C1—C2119.35 (18)C11—C10—H10A119.2
C6—C1—S1121.47 (15)C9—C10—H10A119.2
C2—C1—S1119.17 (15)C10—C11—C7120.0 (2)
C3—C2—C1120.26 (18)C10—C11—H11A120.0
C3—C2—H2A119.9C7—C11—H11A120.0
C1—C2—H2A119.9O4—N4—O3122.0 (3)
C2—C3—C4120.77 (19)O4—N4—C12120.8 (3)
C2—C3—H3A119.6O3—N4—C12117.2 (3)
C4—C3—H3A119.6N4—C12—H12A109.5
N2—C4—C5121.67 (19)N4—C12—H12B109.5
N2—C4—C3120.14 (19)H12A—C12—H12B109.5
C5—C4—C3118.18 (19)N4—C12—H12C109.5
C6—C5—C4121.24 (18)H12A—C12—H12C109.5
C6—C5—H5A119.4H12B—C12—H12C109.5
C4—C5—H5A119.4
O2—S1—N1—C743.60 (19)C3—C4—C5—C63.3 (3)
O1—S1—N1—C7170.79 (16)C4—C5—C6—C11.3 (3)
C1—S1—N1—C775.12 (17)C2—C1—C6—C51.2 (3)
O2—S1—C1—C60.9 (2)S1—C1—C6—C5178.33 (17)
O1—S1—C1—C6126.50 (18)S1—N1—C7—N3176.39 (14)
N1—S1—C1—C6121.65 (17)S1—N1—C7—C113.6 (3)
O2—S1—C1—C2179.59 (16)C8—N3—C7—N1178.0 (2)
O1—S1—C1—C253.96 (18)C8—N3—C7—C112.0 (3)
N1—S1—C1—C257.89 (18)C7—N3—C8—C90.8 (4)
C6—C1—C2—C31.6 (3)N3—C8—C9—C100.6 (4)
S1—C1—C2—C3177.94 (16)C8—C9—C10—C110.6 (5)
C1—C2—C3—C40.5 (3)C9—C10—C11—C70.7 (4)
C2—C3—C4—N2178.6 (2)N1—C7—C11—C10178.1 (2)
C2—C3—C4—C52.9 (3)N3—C7—C11—C101.9 (3)
N2—C4—C5—C6178.2 (2)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N2—H1N2···O2i0.872.102.971 (3)174
N2—H2N2···O1ii0.872.343.162 (3)157
N3—H1N3···N1iii0.86 (2)2.09 (2)2.948 (2)178 (2)
C8—H8A···O1iii0.932.523.160 (3)126
Symmetry codes: (i) x, y1/2, z+1/2; (ii) x1/2, y1/2, z; (iii) x, y+1, z.

Experimental details

Crystal data
Chemical formulaC11H11N3O2S·CH3NO2
Mr310.34
Crystal system, space groupOrthorhombic, Pbca
Temperature (K)296
a, b, c (Å)10.5179 (3), 12.4857 (3), 22.7237 (6)
V3)2984.15 (14)
Z8
Radiation typeCu Kα
µ (mm1)2.14
Crystal size (mm)0.54 × 0.43 × 0.31
Data collection
DiffractometerBruker SMART APEXII CCD
Absorption correctionMulti-scan
(SADABS; Bruker, 2009)
Tmin, Tmax0.392, 0.554
No. of measured, independent and
observed [I > 2σ(I)] reflections
14569, 2799, 2386
Rint0.062
(sin θ/λ)max1)0.615
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.045, 0.144, 1.07
No. of reflections2799
No. of parameters196
H-atom treatmentH atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å3)0.25, 0.42

Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).

Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N2—H1N2···O2i0.872.102.971 (3)174
N2—H2N2···O1ii0.872.343.162 (3)157
N3—H1N3···N1iii0.86 (2)2.09 (2)2.948 (2)178 (2)
C8—H8A···O1iii0.932.523.160 (3)126
Symmetry codes: (i) x, y1/2, z+1/2; (ii) x1/2, y1/2, z; (iii) x, y+1, z.
 

Footnotes

Thomson Reuters ResearcherID: A-5085-2009.

§College of Pharmacy (Visiting Professor), King Saud University, PO Box 2457, Riyadh 11451, Saudi Arabia. Thomson Reuters ResearcherID: A-3561-2009.

Acknowledgements

The authors are grateful for the sponsorship of the Research Center, College of Pharmacy and the Deanship of Scientific Research, King Saud University, Riyadh, Saudi Arabia. HKF and SC thank Universiti Sains Malaysia for the Research University Grant No. 1001/PFIZIK/811160. HKF also thanks the King Saud University, Riyadh, Saudi Arabia, for the award of a visiting Professorship (December 23rd 2011 to January 14th 2012).

References

First citationBruker (2009). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.  Google Scholar
First citationGhorab, M. M., Ragab, F. A., Alqasoumi, S. I., Alafeefy, A. M. & Aboulmaged, S. A. (2009). Eur. J. Med. Chem. 45, 171–178.  Web of Science CrossRef PubMed Google Scholar
First citationSheldrick, G. M. (2008). Acta Cryst. A64, 112–122.  Web of Science CrossRef CAS IUCr Journals Google Scholar
First citationSpek, A. L. (2009). Acta Cryst. D65, 148–155.  Web of Science CrossRef CAS IUCr Journals Google Scholar

This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Follow Acta Cryst. E
Sign up for e-alerts
Follow Acta Cryst. on Twitter
Follow us on facebook
Sign up for RSS feeds