N′-[(E)-4-Benz­yloxy-2-hy­droxy­benzyl­idene]-4-nitro­benzohydrazide monohydrate

The title compound, C(21)H(17)N(3)O(5)·H(2)O, exists in the keto form with an E conformation with respect to the azomethine double bond. The twist angles between the aromatic rings are in the range 4.67 (10)–17.54 (10)°. A water mol­ecule of solvation is present in the lattice. A conventional intra­molecular O—H⋯N hydrogen bond increases the rigidity of the mol­ecule. Inter­molecular O—H⋯O, N—H⋯O and C—H⋯O hydrogen-bonding inter­actions establish a supra­molecular linkage among the mol­ecules in the crystal structure. There are also C—H⋯π inter­actions present.