1-Ethyl-N′-[(E)-4-hydroxy-benzyl-idene]-7-methyl-4-oxo-1,4-dihydro-1, 8-naphthyridine-3-carbohydrazide

Abstract

In the crystal structure of the title compound, C19H 18N4O3, the fused-ring system is essentially planar [maximum deviation is 0.031 (2) Å] while the dihedral angle between the ring system and the benzene ring is 12.64 (6)°.The carbohydrazide H atom is involved in an intra-molecular N - H⋯O hydrogen bond, forming a six-membered hydrogen-bonded ring. The mol-ecules arrange themselves into centrosymmetric dimers by means of inter-molecular O - H⋯O hydrogen bonds.