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In the title compound, C 17 H 16 N 2 O 3 , the seven-membered diazepine ring adopts a boat conformation with the hy­droxy-substituted C atom at the prow and fused benzene ring C atoms at the stern. The phenyl substituent occupies an equatorial position. The amino group of the ring system is a hydrogen-bond donor to the oxo O atom of an inversion-related mol­ecule, and the hy­droxy group is a hydrogen-bond donor to the acetyl O atom of another inversion-related mol­ecule. The two hydrogen bonds generate a ribbon motif parallel to [10    ] in the crystal structure.

5-Acetyl-3-hydroxy-4-phenyl-4,5-dihydro-1H-1,5-benzodiazepin-2(3H)-one