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In the title compound, C16H16N2O4·H2O, the dihedral angle between the two benzene rings is 12.4 (2)° and the mol­ecule adopts an E configuration with respect to the C=N bond. There are intra­molecular O—H...N and O—H...O hydrogen bonds in the hydrazone mol­ecule, which both generate S(6) rings. In the crystal structure, mol­ecules are linked by N—H...O and O—H...O hydrogen bonds, forming layers parallel to the ab plane. The crystal studied was a non-merohedral twin with a domain ratio of 0.887 (3):0.113 (3).
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