title: 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, C(19)H(18)N(4)O(3), 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.
authors.forename: Farah
authors.initials: F
authors.lastname: Deeba
authors.forename: Misbahul Ain
authors.initials: MA
authors.lastname: Khan
authors.forename: Muhammad
authors.initials: M
authors.lastname: Zia-Ur-Rehman
authors.forename: Nagihan
authors.initials: N
authors.lastname: Caylak
authors.forename: Ertan
authors.initials: E
authors.lastname: Sahin