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In the title compound, C9H10N2O2·H2O, 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.