2′-(3-Hydroxy­benzyl­idene)pyrazine-2-carbohydrazide monohydrate

The title compound, C(12)H(10)N(4)O(2)·H(2)O, was synthesized by the reaction of pyrazine-2-carboxylic acid hydrazide and 3-hydroxy­benzaldehyde in ethanol. In the crystal structure, the organic mol­ecules are linked into extended chains by inter­molecular N(amide)—H⋯O(hydr­oxy) hydrogen bonds. Additional hydrogen bonds between the water mol­ecule and three adjacent organic mol­ecules, as well as face-to-face π–π stacking inter­actions between the benzene and pyrazine rings [centroid-to-centroid separation = 3.669 (2) Å and offset = 1.362 Å], link the mol­ecules into a three-dimensional framework.