Literature DB >> 23795029

2-Amino-5-nitro-pyridinium tri-fluoro-acetate.

Josephine Viavulamary Jovita1, Shanmugam Sathya, Govindasamy Usha, Ramachandran Vasanthi, Krishnan Sarada Ezhilarasi.   

Abstract

The title salt, C5H6N3O2 (+)·C2F3O2 (-), crystallizes with two cations and two anions in the asymmetric unit. In the crystal, the acetate and pyridine groups are linked by a pair of N-H⋯O hydrogen bonds, forming loops described by the graph-set motif R 2 (2)(8). These loops are linked via N-H⋯O hydrogen bonds, forming chains along [001]. The chains are in turn linked by C-H⋯O and C-H⋯F hydrogen bonds, generating a three-dimensional supra-molecular network. In both anions, the O and F atoms are disordered over two sites, with occupancy ratios of 0.852 (3):0.148 (3) and 0.851 (3):0.149 (3).

Entities:  

Year:  2013        PMID: 23795029      PMCID: PMC3684927          DOI: 10.1107/S1600536813011896

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


Related literature

For the biological properties of pyridine derivatives and compounds containing the imidazo[1,2-a]pyridine ring system, see: Trapani et al. (2003 ▶); Gueiffier et al. (1998 ▶); Rival et al. (1992 ▶); Rupert et al. (2003 ▶). For the crystal structure of a related compound, see: Hemamalini & Fun (2010 ▶). For hydrogen-bond motifs, see: Bernstein et al. (1995 ▶).

Experimental

Crystal data

C5H6N3O2 +·C2F3O2 M = 506.30 Monoclinic, a = 19.1388 (7) Å b = 10.7716 (4) Å c = 10.0707 (3) Å β = 104.668 (2)° V = 2008.47 (12) Å3 Z = 4 Mo Kα radiation μ = 0.17 mm−1 T = 293 K 0.30 × 0.30 × 0.25 mm

Data collection

Bruker APEXII Kappa CCD diffractometer Absorption correction: multi-scan (SADABS; Bruker, 2004 ▶) T min = 0.950, T max = 0.958 18608 measured reflections 4064 independent reflections 3006 reflections with I > 2σ(I) R int = 0.027

Refinement

R[F 2 > 2σ(F 2)] = 0.042 wR(F 2) = 0.118 S = 1.06 4064 reflections 367 parameters 25 restraints H atoms treated by a mixture of independent and constrained refinement Δρmax = 0.28 e Å−3 Δρmin = −0.30 e Å−3 Data collection: APEX2 (Bruker, 2004 ▶); cell refinement: APEX2 and SAINT (Bruker, 2004 ▶); data reduction: SAINT and XPREP (Bruker, 2004 ▶); program(s) used to solve structure: SIR92 (Altomare et al., 1994 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: PLATON (Spek, 2009 ▶); software used to prepare material for publication: SHELXL97. Click here for additional data file. Crystal structure: contains datablock(s) I, global. DOI: 10.1107/S1600536813011896/su2582sup1.cif Click here for additional data file. Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536813011896/su2582Isup2.hkl Click here for additional data file. Supplementary material file. DOI: 10.1107/S1600536813011896/su2582Isup3.cml Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C5H6N3O2+·C2F3O2F(000) = 1024
Mr = 506.30Dx = 1.674 Mg m3
Monoclinic, P21/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybcCell parameters from 6393 reflections
a = 19.1388 (7) Åθ = 2.2–25.4°
b = 10.7716 (4) ŵ = 0.17 mm1
c = 10.0707 (3) ÅT = 293 K
β = 104.668 (2)°Block, colourless
V = 2008.47 (12) Å30.30 × 0.30 × 0.25 mm
Z = 4
Bruker APEXII Kappa CCD diffractometer4064 independent reflections
Radiation source: fine-focus sealed tube3006 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.027
ω and φ scansθmax = 26.3°, θmin = 2.2°
Absorption correction: multi-scan (SADABS; Bruker, 2004)h = −23→23
Tmin = 0.950, Tmax = 0.958k = −13→13
18608 measured reflectionsl = −12→8
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.042Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.118H atoms treated by a mixture of independent and constrained refinement
S = 1.06w = 1/[σ2(Fo2) + (0.0512P)2 + 0.6997P] where P = (Fo2 + 2Fc2)/3
4064 reflections(Δ/σ)max = 0.001
367 parametersΔρmax = 0.28 e Å3
25 restraintsΔρmin = −0.30 e Å3
Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell esds are taken into account in the estimation of distances, angles and torsion angles.
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)
F1'0.6216 (3)0.0649 (2)0.6851 (3)0.0814 (9)0.852 (3)
F2'0.56447 (14)0.2115 (4)0.5636 (3)0.1083 (15)0.852 (3)
F3'0.63061 (13)0.2483 (2)0.7641 (2)0.0768 (9)0.852 (3)
O3'0.70962 (17)0.31733 (18)0.5942 (3)0.0575 (10)0.852 (3)
O4'0.7170 (6)0.1168 (5)0.5457 (14)0.0457 (12)0.852 (3)
C60.69027 (10)0.20703 (17)0.58967 (18)0.0399 (6)
C70.62582 (11)0.1822 (2)0.6500 (2)0.0512 (7)
F10.624 (2)0.0769 (12)0.717 (2)0.0814 (9)0.148 (3)
F20.5709 (9)0.171 (3)0.5411 (17)0.1083 (15)0.148 (3)
F30.6058 (9)0.2704 (12)0.7193 (13)0.0768 (9)0.148 (3)
O30.6905 (13)0.3188 (9)0.558 (2)0.0575 (10)0.148 (3)
O40.725 (4)0.122 (3)0.555 (9)0.0457 (12)0.148 (3)
F41.09841 (15)0.2673 (2)0.9010 (3)0.1233 (10)0.851 (3)
F51.15881 (12)0.1049 (2)0.8967 (2)0.1058 (9)0.851 (3)
F61.08797 (13)0.1125 (3)1.0222 (3)0.1281 (12)0.851 (3)
O71.2114 (4)0.3372 (2)1.0927 (10)0.0567 (16)0.851 (3)
O81.2245 (3)0.1454 (6)1.1793 (7)0.0529 (13)0.851 (3)
C131.19568 (11)0.22682 (19)1.0956 (2)0.0450 (7)
C141.13362 (13)0.1801 (2)0.9792 (2)0.0613 (8)
F4'1.1391 (8)0.2274 (13)0.8650 (10)0.1233 (10)0.149 (3)
F5'1.1264 (8)0.0609 (8)0.9603 (13)0.1058 (9)0.149 (3)
F6'1.0714 (5)0.2141 (16)0.9973 (18)0.1281 (12)0.149 (3)
O7'1.195 (2)0.3400 (9)1.109 (6)0.054 (9)0.149 (3)
O8'1.2391 (18)0.150 (3)1.163 (4)0.045 (6)0.149 (3)
O10.96571 (10)0.58183 (17)0.87250 (19)0.0753 (7)
O21.00888 (11)0.4598 (2)0.7436 (3)0.0991 (9)
N10.82378 (8)0.31869 (13)0.91912 (15)0.0381 (5)
N20.78170 (10)0.11850 (16)0.8954 (2)0.0517 (6)
N30.96796 (10)0.4827 (2)0.8153 (2)0.0606 (7)
C10.86882 (10)0.40934 (17)0.90128 (18)0.0408 (6)
C20.91883 (10)0.38461 (18)0.83148 (19)0.0437 (6)
C30.92425 (11)0.2660 (2)0.7785 (2)0.0500 (7)
C40.87916 (10)0.1762 (2)0.7980 (2)0.0490 (7)
C50.82704 (9)0.20153 (17)0.87184 (18)0.0385 (5)
O51.44036 (10)0.50593 (17)1.1714 (2)0.0860 (7)
O61.48351 (9)0.36088 (19)1.31572 (16)0.0756 (6)
N41.32454 (8)0.25957 (13)0.90524 (15)0.0403 (5)
N51.30568 (10)0.06118 (17)0.82079 (19)0.0533 (6)
N61.44654 (9)0.3977 (2)1.20577 (19)0.0564 (7)
C81.35833 (10)0.34404 (17)0.99745 (19)0.0417 (6)
C91.40837 (10)0.30535 (18)1.10970 (19)0.0425 (6)
C101.42431 (10)0.17906 (19)1.1319 (2)0.0477 (6)
C111.39007 (11)0.09627 (18)1.0385 (2)0.0459 (6)
C121.33876 (10)0.13646 (16)0.91913 (19)0.0394 (6)
H10.865600.488300.936700.0490*
H1A0.791500.335700.962300.0460*
H2A0.7521 (11)0.135 (2)0.953 (2)0.065 (7)*
H2B0.7837 (13)0.0419 (17)0.862 (2)0.068 (7)*
H30.958700.249500.730200.0600*
H40.882200.097100.762800.0590*
H4A1.292500.284800.834200.0480*
H5A1.2713 (10)0.092 (2)0.7491 (18)0.065 (7)*
H5B1.3104 (13)−0.018 (2)0.840 (2)0.066 (7)*
H81.347400.428000.984100.0500*
H101.458200.152901.210300.0570*
H111.400100.012101.052400.0550*
U11U22U33U12U13U23
F1'0.1041 (13)0.0575 (10)0.108 (2)−0.0127 (10)0.074 (2)0.0002 (11)
F2'0.0443 (10)0.182 (4)0.0999 (15)0.0261 (13)0.0206 (10)0.0242 (15)
F3'0.0902 (18)0.0800 (13)0.0738 (14)0.0095 (10)0.0457 (12)−0.0166 (11)
O3'0.076 (2)0.0308 (8)0.076 (2)−0.0038 (9)0.0383 (15)−0.0069 (8)
O4'0.048 (3)0.0320 (9)0.064 (2)0.0004 (12)0.027 (3)−0.0028 (9)
C60.0466 (10)0.0315 (10)0.0434 (10)0.0018 (8)0.0145 (8)0.0004 (8)
C70.0504 (12)0.0497 (12)0.0588 (12)0.0055 (10)0.0237 (10)0.0010 (10)
F10.1041 (13)0.0575 (10)0.108 (2)−0.0127 (10)0.074 (2)0.0002 (11)
F20.0443 (10)0.182 (4)0.0999 (15)0.0261 (13)0.0206 (10)0.0242 (15)
F30.0902 (18)0.0800 (13)0.0738 (14)0.0095 (10)0.0457 (12)−0.0166 (11)
O30.076 (2)0.0308 (8)0.076 (2)−0.0038 (9)0.0383 (15)−0.0069 (8)
O40.048 (3)0.0320 (9)0.064 (2)0.0004 (12)0.027 (3)−0.0028 (9)
F40.109 (2)0.0852 (15)0.1244 (18)0.0264 (13)−0.0654 (16)0.0034 (13)
F50.0952 (16)0.1350 (19)0.0739 (13)0.0144 (14)−0.0033 (10)−0.0568 (13)
F60.0820 (14)0.178 (3)0.1117 (17)−0.0743 (18)0.0010 (13)−0.0013 (19)
O70.056 (4)0.0419 (17)0.0666 (17)0.0009 (13)0.005 (2)0.0002 (15)
O80.056 (3)0.0368 (15)0.055 (2)0.0024 (17)−0.006 (2)−0.0057 (13)
C130.0423 (11)0.0408 (12)0.0486 (11)0.0064 (9)0.0052 (8)−0.0068 (9)
C140.0556 (13)0.0542 (14)0.0627 (14)0.0072 (11)−0.0061 (11)−0.0064 (11)
F4'0.109 (2)0.0852 (15)0.1244 (18)0.0264 (13)−0.0654 (16)0.0034 (13)
F5'0.0952 (16)0.1350 (19)0.0739 (13)0.0144 (14)−0.0033 (10)−0.0568 (13)
F6'0.0820 (14)0.178 (3)0.1117 (17)−0.0743 (18)0.0010 (13)−0.0013 (19)
O7'0.043 (14)0.026 (8)0.08 (2)0.013 (6)−0.006 (12)−0.014 (8)
O8'0.034 (9)0.044 (10)0.059 (10)0.005 (7)0.015 (7)−0.007 (6)
O10.0771 (12)0.0604 (11)0.0829 (12)−0.0246 (9)0.0099 (9)0.0145 (9)
O20.0768 (13)0.0950 (15)0.1466 (19)0.0023 (11)0.0674 (14)0.0403 (13)
N10.0381 (8)0.0327 (8)0.0460 (8)0.0026 (6)0.0153 (6)−0.0017 (6)
N20.0548 (11)0.0353 (10)0.0711 (12)−0.0039 (8)0.0271 (9)−0.0098 (8)
N30.0436 (10)0.0655 (14)0.0702 (12)−0.0022 (9)0.0098 (9)0.0302 (11)
C10.0414 (10)0.0332 (9)0.0453 (10)0.0011 (8)0.0062 (8)0.0046 (8)
C20.0334 (9)0.0471 (11)0.0488 (10)0.0008 (8)0.0069 (8)0.0134 (9)
C30.0377 (10)0.0625 (14)0.0528 (11)0.0094 (9)0.0169 (9)0.0043 (10)
C40.0451 (11)0.0465 (12)0.0564 (11)0.0077 (9)0.0147 (9)−0.0095 (9)
C50.0369 (9)0.0337 (9)0.0440 (9)0.0035 (8)0.0085 (8)−0.0022 (8)
O50.0863 (13)0.0543 (11)0.1018 (14)−0.0114 (10)−0.0050 (11)−0.0169 (10)
O60.0656 (10)0.1026 (14)0.0505 (9)0.0010 (10)−0.0002 (8)−0.0128 (9)
N40.0404 (8)0.0309 (8)0.0449 (8)0.0026 (6)0.0024 (7)0.0069 (7)
N50.0614 (11)0.0309 (9)0.0612 (11)−0.0006 (8)0.0036 (9)0.0047 (8)
N60.0433 (10)0.0675 (13)0.0565 (11)−0.0012 (9)0.0093 (8)−0.0115 (9)
C80.0407 (10)0.0317 (9)0.0524 (10)0.0002 (8)0.0115 (8)0.0022 (8)
C90.0368 (10)0.0452 (11)0.0456 (10)0.0002 (8)0.0107 (8)−0.0004 (8)
C100.0424 (10)0.0550 (13)0.0444 (10)0.0077 (9)0.0087 (8)0.0127 (9)
C110.0501 (11)0.0354 (10)0.0522 (11)0.0088 (9)0.0129 (9)0.0142 (9)
C120.0398 (10)0.0305 (9)0.0489 (10)0.0007 (8)0.0131 (8)0.0075 (8)
F1—C71.325 (16)N3—C21.451 (3)
F1'—C71.320 (3)N1—H1A0.8600
F2—C71.319 (17)N2—H2B0.896 (19)
F2'—C71.311 (4)N2—H2A0.93 (2)
F3—C71.293 (14)N4—C121.354 (2)
F3'—C71.335 (3)N4—C81.343 (2)
F4—C141.299 (3)N5—C121.312 (3)
F4'—C141.286 (11)N6—C91.450 (3)
F5—C141.335 (3)N4—H4A0.8600
F5'—C141.300 (9)N5—H5A0.908 (19)
F6—C141.293 (4)N5—H5B0.87 (2)
F6'—C141.302 (12)C6—C71.530 (3)
O3—C61.246 (11)C13—C141.527 (3)
O3'—C61.242 (3)C1—C21.350 (3)
O4—C61.23 (6)C2—C31.399 (3)
O4'—C61.232 (9)C3—C41.343 (3)
O7—C131.229 (4)C4—C51.414 (3)
O7'—C131.227 (12)C1—H10.9300
O8—C131.244 (7)C3—H30.9300
O8'—C131.25 (4)C4—H40.9300
O1—N31.219 (3)C8—C91.349 (3)
O2—N31.217 (3)C9—C101.400 (3)
O5—N61.213 (3)C10—C111.341 (3)
O6—N61.220 (2)C11—C121.414 (3)
N1—C11.344 (2)C8—H80.9300
N1—C51.356 (2)C10—H100.9300
N2—C51.309 (3)C11—H110.9300
C1—N1—C5122.76 (16)F4—C14—C13114.2 (2)
O1—N3—C2118.91 (19)F5'—C14—C13118.1 (6)
O2—N3—C2116.9 (2)F6'—C14—C13111.2 (8)
O1—N3—O2124.2 (2)F4'—C14—F5'106.9 (8)
C5—N1—H1A119.00F5—C14—C13110.2 (2)
C1—N1—H1A119.00F4'—C14—C13109.4 (6)
H2A—N2—H2B120 (2)F5—C14—F6104.4 (2)
C5—N2—H2B117.9 (16)F4—C14—F6108.6 (3)
C5—N2—H2A121.5 (13)F5'—C14—F6'103.4 (10)
C8—N4—C12122.89 (16)F6—C14—C13112.9 (2)
O5—N6—C9118.21 (18)F4'—C14—F6'107.4 (10)
O6—N6—C9117.5 (2)F4—C14—F5106.0 (2)
O5—N6—O6124.3 (2)N1—C1—C2119.31 (17)
C12—N4—H4A119.00N3—C2—C3120.64 (18)
C8—N4—H4A119.00C1—C2—C3120.66 (18)
C12—N5—H5B115.7 (14)N3—C2—C1118.69 (18)
C12—N5—H5A119.2 (13)C2—C3—C4119.31 (19)
H5A—N5—H5B123 (2)C3—C4—C5120.19 (19)
O3'—C6—C7114.6 (2)N2—C5—C4123.50 (18)
O4—C6—C7122 (3)N1—C5—N2118.73 (17)
O4'—C6—C7117.1 (5)N1—C5—C4117.76 (17)
O3—C6—C7109.0 (11)C2—C1—H1120.00
O3'—C6—O4'128.4 (5)N1—C1—H1120.00
O3—C6—O4128 (3)C2—C3—H3120.00
F2'—C7—F3'107.3 (2)C4—C3—H3120.00
F2—C7—F3103.5 (14)C5—C4—H4120.00
F1'—C7—F3'106.0 (2)C3—C4—H4120.00
F1'—C7—C6112.6 (3)N4—C8—C9119.03 (17)
F3'—C7—C6111.22 (19)N6—C9—C8118.56 (18)
F3—C7—C6117.7 (7)C8—C9—C10120.92 (18)
F2'—C7—C6111.8 (2)N6—C9—C10120.51 (17)
F1—C7—F3107.7 (12)C9—C10—C11119.10 (18)
F2—C7—C6103.8 (8)C10—C11—C12120.25 (18)
F1—C7—F2103.1 (18)N4—C12—C11117.77 (16)
F1'—C7—F2'107.6 (3)N5—C12—C11123.44 (17)
F1—C7—C6118.7 (16)N4—C12—N5118.78 (17)
O8'—C13—C14118.8 (16)N4—C8—H8120.00
O7—C13—O8129.0 (5)C9—C8—H8120.00
O7—C13—C14116.6 (5)C9—C10—H10120.00
O7'—C13—O8'129 (3)C11—C10—H10120.00
O7'—C13—C14113 (2)C10—C11—H11120.00
O8—C13—C14114.4 (3)C12—C11—H11120.00
C1—N1—C5—C4−1.6 (3)O8—C13—C14—F647.9 (4)
C1—N1—C5—N2179.07 (18)O7—C13—C14—F4−9.0 (5)
C5—N1—C1—C21.2 (3)O8—C13—C14—F4172.6 (4)
O2—N3—C2—C1−174.9 (2)O8—C13—C14—F5−68.3 (4)
O1—N3—C2—C14.7 (3)O7—C13—C14—F5110.1 (5)
O2—N3—C2—C36.5 (3)O7—C13—C14—F6−133.7 (5)
O1—N3—C2—C3−173.9 (2)N1—C1—C2—N3−178.84 (17)
C12—N4—C8—C9−0.5 (3)N1—C1—C2—C3−0.3 (3)
C8—N4—C12—C111.9 (3)C1—C2—C3—C4−0.2 (3)
C8—N4—C12—N5−176.76 (19)N3—C2—C3—C4178.37 (19)
O5—N6—C9—C10167.4 (2)C2—C3—C4—C5−0.3 (3)
O5—N6—C9—C8−11.3 (3)C3—C4—C5—N11.1 (3)
O6—N6—C9—C10−11.8 (3)C3—C4—C5—N2−179.6 (2)
O6—N6—C9—C8169.47 (19)N4—C8—C9—C10−1.1 (3)
O4'—C6—C7—F3'138.5 (7)N4—C8—C9—N6177.59 (17)
O4'—C6—C7—F1'19.7 (7)C8—C9—C10—C111.2 (3)
O3'—C6—C7—F2'79.7 (3)N6—C9—C10—C11−177.44 (19)
O4'—C6—C7—F2'−101.6 (7)C9—C10—C11—C120.2 (3)
O3'—C6—C7—F1'−159.0 (3)C10—C11—C12—N5176.9 (2)
O3'—C6—C7—F3'−40.3 (3)C10—C11—C12—N4−1.7 (3)
D—H···AD—HH···AD···AD—H···A
N1—H1A···O4′i0.861.902.758 (12)175
N2—H2A···O3′i0.93 (2)1.88 (2)2.791 (4)168 (2)
N2—H2B···O8ii0.90 (2)2.06 (2)2.935 (7)166 (2)
N4—H4A···O8iii0.861.912.772 (7)175
N5—H5A···O7iii0.91 (2)1.86 (2)2.763 (9)172 (2)
N5—H5B···O3′iv0.87 (2)1.97 (2)2.801 (3)160 (2)
C1—H1···O7v0.932.363.140 (5)141
C4—H4···O2iv0.932.573.264 (3)132
C8—H8···F1′vi0.932.443.089 (3)127
C8—H8···O4′vi0.932.363.253 (7)161
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯A D—HH⋯A DA D—H⋯A
N1—H1A⋯O4′i 0.861.902.758 (12)175
N2—H2A⋯O3′i 0.93 (2)1.88 (2)2.791 (4)168 (2)
N2—H2B⋯O8ii 0.90 (2)2.06 (2)2.935 (7)166 (2)
N4—H4A⋯O8iii 0.861.912.772 (7)175
N5—H5A⋯O7iii 0.91 (2)1.86 (2)2.763 (9)172 (2)
N5—H5B⋯O3′iv 0.87 (2)1.97 (2)2.801 (3)160 (2)
C1—H1⋯O7v 0.932.363.140 (5)141
C4—H4⋯O2iv 0.932.573.264 (3)132
C8—H8⋯F1′vi 0.932.443.089 (3)127
C8—H8⋯O4′vi 0.932.363.253 (7)161

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) ; (v) ; (vi) .

  7 in total

1.  Synthesis and antibacterial activity of some imidazo[1,2-a]pyrimidine derivatives.

Authors:  Y Rival; G Grassy; G Michel
Journal:  Chem Pharm Bull (Tokyo)       Date:  1992-05       Impact factor: 1.645

2.  A short history of SHELX.

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

3.  Synthesis of imidazo[1,2-a]pyridines as antiviral agents.

Authors:  A Gueiffier; S Mavel; M Lhassani; A Elhakmaoui; R Snoeck; G Andrei; O Chavignon; J C Teulade; M Witvrouw; J Balzarini; E De Clercq; J P Chapat
Journal:  J Med Chem       Date:  1998-12-03       Impact factor: 7.446

4.  2-Amino-4-methyl-pyridinium trifluoro-acetate.

Authors:  Madhukar Hemamalini; Hoong-Kun Fun
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2010-03-10

5.  Imidazopyrimidines, potent inhibitors of p38 MAP kinase.

Authors:  Kenneth C Rupert; James R Henry; John H Dodd; Scott A Wadsworth; Druie E Cavender; Gilbert C Olini; Bohumila Fahmy; John J Siekierka
Journal:  Bioorg Med Chem Lett       Date:  2003-02-10       Impact factor: 2.823

6.  Alpidem analogues containing a GABA or glycine moiety as new anticonvulsant agents.

Authors:  Giuseppe Trapani; Andrea Latrofa; Massimo Franco; Antonio Carrieri; Saverio Cellamare; Mariangela Serra; Enrico Sanna; Giovanni Biggio; Gaetano Liso
Journal:  Eur J Pharm Sci       Date:  2003-03       Impact factor: 4.384

7.  Structure validation in chemical crystallography.

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

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