5-Dichloro-acetyl-4-methyl-2,3,4,5-tetra-hydro-1H-1,5-benzodiazepin-2-one hemihydrate.

There are two crystallographically independent organic mol-ecules in the asymmetric unit of the title compound, C(12)H(12)Cl(2)N(2)O(2)·0.5H(2)O. The benzodiazepine ring adopts a distorted boat conformation in both molecules. The crystal packing is controlled by N-H⋯O, C-H⋯O and O-H⋯O intra- and inter-molecular hydrogen bonds. A graph-set motif of R(3) (3)(14) dimer formation by a combination of N-H⋯O, O-H⋯O and C-H⋯O hydrogen bonds stabilizes the mol-ecules and extends along a axis.