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The seven-membered fused-ring in the title compound, C10H10N2O·H2O, adopts a boat conformation (with the two phenyl­ene C atoms representing the stern and the methyl­ene C atom the prow). In the crystal, two benzodiazepinone mol­ecules are linked about a center of inversion by diazepine–carbonyl N—H...O hydrogen bonds. The dimers are further linked by water–diazepine O—H...N hydrogen bonds, forming a linear chain.

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In the title N-substituted benzimidazol-2-one, C10H10N2O, the fused ring system is almost planar (r.m.s. deviation = 0.01 Å) and aligned at 57.9 (1)° with respect to the propenyl fragment. In the crystal, adjacent mol­ecules are linked by pairs of N—H...O hydrogen bonds into inversion dimers.
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