(Z)-5-[4-(Dimethyl­amino)­benzyl­idene]-2-(piperidin-1-yl)-1,3-thia­zolidin-4(5H)-one

The mol­ecules of the title compound, C₁₇H₂₁N₃OS, are characterized by a wide C-C-C angle at the methine C atom linking the aryl and thia­zolidine rings, associated with a short repulsive intra­molecular S...H contact between atoms in these two rings. A single piperidine-arene C-H...[pi] hydrogen bond links pairs of mol­ecules into centrosymmetric dimers.

Hydrogen-bonded sheet structures in methyl 4-(4-chloro­anilino)-3-nitro­benzoate and methyl 1-benzyl-2-(4-chloro­phen­yl)-1H-benzimidazole-5-carboxyl­ate

In methyl 4-(4-chloro­anilino)-3-nitro­benzoate, C₁₄H₁₁ClN₂O₄, (I), there is an intra­molecular N-H...O hydrogen bond and the intra­molecular distances provide evidence for electronic polarization of the o-quinonoid type. The mol­ecules are linked into sheets built from N-H...O, C-H...O and C-H...[pi](arene) hydrogen bonds, together with an aromatic [pi]-[pi] stacking inter­action. The mol­ecules of methyl 1-benzyl-2-(4-chloro­phenyl)-1H-benzimidazole-5-carboxyl­ate, C₂₂H₁₇ClN₂O₂, (II), are also linked into sheets, this time by a combination of C-H...[pi](arene) hydrogen bonds and aromatic [pi]-[pi] stacking inter­actions.