3-Amino-5-(piperidin-1-yl)thio­phene-2,4-dicarbonitrile

In the title compound, C₁₁H₁₂N₄S, the thio­phene ring is roughly planar, with a maximum deviation of 0.012 (1) Å for the S atom, and makes a dihedral angle of 7.89 (8)° with the mean plane of the piperidine ring, which is in a chair conformation. The crystal packing is stabilized by pairs of centrosymmetric inter­molecular N—H...N hydrogen bonds, which results in the formation of a step-wise chain parallel to [10].

(Z)-4-Chloro-N-(1-{2-[3-(4-chloro­benzoyl)ureido]eth­yl}imidazolidin-2-yl­idene)benzamide

The title compound, C₂₀H₁₉Cl₂N₅O₂S, was obtained from the reaction of 4-chloro­benzoyl isothio­cyanate with diethyl­ene­triamine. The imidazolidine ring is slightly twisted with an N—C—C—N torsion angle of 15.4 (4)°, while the thio­urea moiety maintains its trans–cis geometry. The mol­ecule is stabilized by intramolecular N—H...O hydrogen bonds. The crystal structure features N—H...O, N—H...S and C—H...O hydrogen bonds and π–π interactions between benzene rings with a centroid–centroid distance of 3.607 (3) Å.