Crystal structure of 2-(2,3-di­methyl­anilino)-N′-[(1E)-2-hy­droxy­benzyl­idene]benzohydrazide

The asymmetric unit of the title compound, C(22)H(21)N(3)O(2), consists of two independent mol­ecules (A and B) having differing conformations. The differences mainly concern the dihedral angles which the hy­droxy­phenyl and di­methyl­phenyl rings subtend to the central phenyl­ene ring, these being 30.16 (6) and 58.60 (6)° in mol­ecule A and 13.42 (7) and 60.31 (7)° in B. With the exception of the dimethyphenyl substituent, the conformations of the rest of each mol­ecule are largely determined by intra­molecular O—H⋯N and N—H⋯O hydrogen bonds. In the crystal, N—H⋯O hydrogen bonds link the mol­ecules into chains extending parallel to the a axis in which the types of mol­ecules alternate in an …A…B…A…B… fashion.