(E)-N′-(4-Pyridylmethyl­ene)-4-(8-quinol­yl­oxy)butanohydrazide 0.25-hydrate

The asymmetric unit of the title compound, C(19)H(18)N(4)O(2)·0.25H(2)O, contains two organic mol­ecules and a solvent water mol­ecule with 50% occupancy. The two molecules differ in their conformations: in one mol­ecule it is (+)gauche-trans-trans-(+)gauche-trans, whereas in the other it is (−)gauche-trans-trans-(−)gauche-trans. The dihedral angles between the pyridine ring and the quinoline ring system are 67.4 (3) and 68.0 (2)°. Mol­ecules are linked into a supra­molecular two-dimensional array via N—H⋯N hydrogen bonds, with each partially occupied water mol­ecule connected via an O—H⋯O hydrogen bond. C—H⋯O inter­actions are also present.