N′-[(E)-4-(Diethyl­amino)benzyl­idene]-4-nitro­benzohydrazide monohydrate

In the title compound, C(18)H(20)N(4)O(3)·H(2)O, the two aromatic rings are linked through a methyl­idenehydrazide fragment, which is fully extended with C—C—N—N, C—N—N=C and N—N=C—C torsion angles of 179.4 (2), 174.7 (2) and 178.3 (2)°, respectively. The dihedral angle between the two aromatic rings is 7.01 (8)°. In the crystal structure, the water of hydration is involved in extensive hydrogen bonding. Inter­molecular O—H⋯O, N—H⋯O and O—H⋯N hydrogen bonds link the components of the structure into a two-dimensional network and additional stabilization is provided by weak inter­molecular C—H⋯O hydrogen bonds.