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1.  (E)-N-{[6-Chloro-4-(4-chloro­phen­yl)-3-methyl-1-phenyl-1H-pyrazolo[3,4-b]pyridin-5-yl]methyl­ene}benzene-1,2-diamine: a three-dimensional framework structure built from only two hydrogen bonds 
The mol­ecules of the title compound, C26H19Cl2N5, are conformationally chiral, with none of the aryl groups coplanar with the pyrazolo[3,4-b]pyridine core of the mol­ecule. A single unique N—H⋯N hydrogen bond links the mol­ecules into two symmetry-related sets of C(11) chains running parallel to the [011] and [01] directions, respectively, and these two sets of chains are linked into a continuous three-dimensional framework structure by a single unique C—H⋯N hydrogen bond which forms a chain parallel to the [100] direction.
PMCID: PMC2855570  PMID: 20203411
2.  (E)-3-(4-Methyl­phen­yl)-2-(2-thien­yl)­acrylonitrile has Z′ = 0.75 in the space group C2/m: fourfold disordered mol­ecules lie in channels enclosed by fully ordered mol­ecules 
The title compound, C14H11NS, crystallizes with Z′ = 0.75 in the space group C2/m. Two independent mol­ecules are present, one of which lies with all the non-H atoms on a mirror plane, while the other is fourfold disordered across a site of 2/m symmetry. The ordered mol­ecules are stacked such that they enclose continuous channels running along twofold rotation axes, and the disordered mol­ecules are positioned within these channels.
PMCID: PMC2737424  PMID: 19726858

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