3-Hydroxy-4-phenyl-1-(prop-2-en-1-yl)-2,3,4,5-tetrahydro-1H-1,5-benzodiazepin-2-one

The asymmetric unit of the title compound, C18H18N2O2, contains three independent molecules. In each, the seven-membered diazepine ring adopts a boat conformation with the hydroxy-substituted C atom at the prow and fused-ring C atoms at the stern. In the crystal, the molecules are linked by O—H...O and N—H...O hydrogen bonds. The allyl group of one molecule is equally disordered over two positions