N′-(4-Hydroxy­benzyl­idene)aceto­hydrazide monohydrate

In the title compound, C(9)H(10)N(2)O(2)·H(2)O, the mol­ecular skeleton of the acetohydrazide mol­ecule is nearly planar [within 0.014 (1) Å]. The mol­ecule adopts a trans configuration with respect to the C=N bond, while the side chain is slightly twisted away from the attached ring, forming a dihedral angle of 9.975 (8)°. The crystal packing exhibits a three-dimensional network composed from alternating acetohydrazide mol­ecules and uncoordinated water mol­ecules, which inter­act via N—H⋯O, O—H⋯O and O—H⋯N hydrogen bonds. A C—H⋯π inter­action is also present.