N′-Diphenyl­methyl­ene-2-hydroxy­benzohydrazide

The title compound, C20H16N2O2, was synthesized by the reaction of 2-hydroxy­benzohydrazide with diphenyl­methanone. The dihedral angle between the phenyl rings is 76.28 (11)°. The amino H atom is involved in an intra­molecular N—H⋯O hydrogen bond. In the crystal structure, the hydr­oxy groups and carbonyl O atoms form inter­molecular O—H⋯O hydrogen bonds, which link the mol­ecules into chains running along the b axis