2-Hy­droxy-2,3,5,10,11,11a-hexa­hydro-1H-pyrrolo­[2,1-c][1,4]benzodiazepine-5,11-dione

The seven-membered ring of the title compound, C(12)H(12)N(2)O(3), which is fused with the phenyl­ene ring, adopts a boat-shaped conformation (with the methine C atom as the prow and the phenyl­ene C atoms as the stern); the H atom on the methine linkage exists in an axial position. The five-membered ring that is fused with the seven-membered ring adopts an envelope conformation (with the C atom bearing the hy­droxy substituent representing the flap) [the deviation from the plane defined by the other four atoms is 0.200 (7) Å in one mol­ecule and 0.627 (5) Å in the other]. The two independent mol­ecules are disposed about a pseudo center of inversion and are connected by a pair of N—H⋯O hydrogen bonds. Adjacent dimers are linked by a pair of O—H⋯O hydrogen bonds, generating a chain running along the b axis.