The whole molecule of the title compound, C(19)H(14)N(4)O(2), is essentially planar, with a highly conjugated pi system. In the crystal, the molecules are packed as chains along the  direction connected by O-H.N intermolecular hydrogen bonds.
The crystal structure of the title compound, C(15)H(14)N(2)O(2). H(2)O, is in the keto tautomeric form and the configuration at the azomethine C=N double bond is E. The molecule is non-planar, with a dihedral angle of 27.3 (1) degrees between the aromatic rings. The crystal structure is stabilized by extensive hydrogen bonding involving the water molecule and hydrazone moiety.