N'-[(E)-1-(5-Chloro-2-hy-droxy-phen-yl)ethyl-idene]pyridine-3-carbohydrazide monohydrate.

In the title compound, C(14)H(12)ClN(3)O(2)·H(2)O, the benzene ring and the pyridine rings are oriented at a dihedral angle of 57.73 (12)° and an intra-molecular O-H⋯N hydrogen bond generates an S(6) ring. In the crystal, the water mol-ecule forms O-H⋯O and O-H⋯N hydrogen bonds to the organic mol-ecule, leading to chains containing R(4) (4)(16) loops. In addition, weak aromatic π-π stacking inter-actions between the centroids of pyridine rings [at distance of 3.864 (2) and 4.013 (2) Å] and C-H⋯π inter-actions occur.