12-(N-Benzoylimino)-11,12-dihydrobenzimidazo[2,1-b][1,3,5]benzothiadiazepine

The title compound, C₂₁H₁₄N₄OS, was prepared from the reaction of N-[2-(1H-benzimidazol-2-ylthio)phenyl]N'-benzoylthiourea with dicyclohexylcarbodiimide. A puckered seven-membered ring and a short H...H contact between two rings cause the whole molecule to be non-coplanar, even though the delocalized π-bonding system is planar. There is an intramolecular hydrogen bond between the amine H and the O atom of the carbonyl group.

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