N′-[(E)-Benzylidene]-1-ethyl-7-methyl-4-oxo-1,4-dihydro-1, 8-naphthyridine-3-carbohydrazide

Abstract

In the title compound, C19H18N4O 2, the 1,8-naphthyridine ring system is essentially planar [r.m.s. deviation = 0.011 (3) Å]. The dihedral angle between the naphthyridine ring system and the phenyl ring is 28.95 (7)°. The carbohydrazide H atom is involved in an intra-molecular N - H⋯O hydrogen bond, forming a six-membered hydrogen-bonded ring. In the crystal, the mol-ecules arrange themselves into centrosymmetric dimers by means of inter-molecular C - H⋯O hydrogen bonds.