Crystal structure and Hirshfeld surface analysis of a new benzodiazepine derivative: 4-di-chloro-methyl-2,3-di-hydro-1-1,5-benzodiazepin-2-one.

In the title compound, CHClNO, the seven-membered diazepine ring adopts a boat-shaped conformation. The mean planes of the two rings of the benzodiazepine unit are inclined to each other by 22.05 (6)°. In the crystal, mol-ecules are linked by pairs of N-H⋯O hydrogen bonds, forming inversion dimers with an (8) ring motif. The dimers are linked by C-H⋯π inter-actions, forming layers lying parallel to (10). The roles of the inter-molecular inter-actions in the crystal packing were clarified using Hirshfeld surface analysis; the most important contributions are from Cl⋯H/H⋯Cl (30.5%) and H⋯H (22.5%) inter-actions.