Crystal structure of 2-(2,3-dimethyl-anilino)-N′-[(1E)-2-hydroxybenzyl-ideneThenzohydrazide

The asymmetric unit of the title compound, C22H21N3O2, 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)degrees in molecule A and 13.42 (7) and 60.31 (7)degrees in B. With the exception of the dimethyphenyl substituent, the conformations of the rest of each molecule are largely determined by intramolecular O-H center dot center dot center dot N and N-H center dot center dot center dot O hydrogen bonds. In the crystal, N-H center dot center dot center dot 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.