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In the title compound, C16H12N2S2, the thio­phene groups are rotationally disordered over two sets of sites, by approximately 180°, with occupancy ratios of 0.916 (2):0.084 (2) and 0.903 (2):0.097 (2). The major components of the thio­phene and methyl­ene substituted thio­phene rings are canted by 24.06 (12) and 85.07 (10)°, respectively, from the benzimidazole ring system plane and the dihedral angle between the major component thio­phene ring planes is 84.90 (14)°. In the crystal, there is a weak C—H...N hydrogen bond which links mol­ecules into chains.

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In the title mol­ecule, C11H9N3O2S, the thio­phene and benzene rings form a dihedral angle of 17.68 (9)°. The thio­phene S atom and the imine N atom are syn with respect to each other. In the crystal, N—H...O and N—H...N hydrogen bonds connect mol­ecules, forming a two-dimensional network parallel to (10-1).

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The title hydrated salt, C21H17N2O3+·Cl·H2O, exhibits disorder in one of the furan rings. The major and minor components have a refined occupancy ratio of 0.844 (19):0.156 (19). The structure displays intermolecular hydrogen bonding involving the water molecule and the chloride anion. Close intermolecular C—H...Cl and C—H...(furan ring) inter­actions complete the hydrogen bonding.
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