The title compound [systematic name: 4-amino-2'-(di-2-pyridylmethylene)benzohydrazide hydrate], C(18)H(15)N(5)O.H(2)O, crystallizes in the triclinic space group P-1. Structural analysis shows one pyridine ring and the p-aminobenzoylhydrazone moiety to be coplanar and orthogonal to the second pyridine ring. The packing reveals infinite molecular units interlocked via a network of hydrogen bonds.
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