(E)-N '-(5-Chloro-2-hydroxybenzylidene)-3,5-dihydroxybenzohydrazide monohydrate

In the title compound, C14H11ClN2O4 center dot H2O, the dihedral angle between the two benzene rings is 8.5 (2)degrees and an intramolecular O-H center dot center dot center dot N hydrogen bond is observed in the Schiff base molecule. In the crystal structure, the water molecule accepts an N-H center dot center dot center dot O hydrogen bond and makes O-H center dot center dot center dot O hydrogen bonds to two further Schiff base molecules. Further intermolecular O-H center dot center dot center dot O hydrogen bonds lead to the formation of layers parallel to the bc plane.