The asymmetric unit of the title compound, C18H20N2O5·H2O, consists of a benzohydrazide molecule which exists in anEconformation with respect to the C=N imine bond and a water molecule. The dihedral angle between the aromatic rings is 41.67 (9)°. The methoxy substituent of the 4-methoxyphenyl group is twisted at an angle of 6.8 (3)° out of the plane of the attached benzene ring. In the 2,4,5-trimethoxyphenyl unit, thepara-methoxy group is coplanar with the ring [C—C—O—C = −1.5 (3)°], whereas theortho- andmeta-methoxy groups are twisted out of the plane of the ring [C—C—O—C = 75.4 (2) and −67.1 (2)°, respectively]. Two molecules are connected by two water moleculesviaO—H...O hydrogen bonds, generating anR22(8) ring motif. One of the water H atoms forms an additional hydrogen bond to an N atom. The water molecules act as an acceptor for an N—H...O hydrogen bond. As a result, a three-dimensional network is formed.
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