A new polymorph of N-(2-{N'-[(1E)-2-hy-droxy-benzyl-idene]hydrazinecarbon-yl}phen-yl)benzamide.

The title compound, C21H17N3O3, is a new polymorph of an already published structure [Shashidhar et al. (2006 ▶). Acta Cryst. E62, o4473-o4475]. The previously reported structure crystallizes in the monoclinic space group C2/c, whereas the structure reported here is in the tetra-gonal space group I41/a. The bond lengths and angles are similar in both structures. The mol-ecule adopts an extended conformation via intra-molecular N-H⋯O and O-H⋯N hydrogen bonds; the terminal phenyl ring and the hy-droxy-lphenyl ring are twisted with respect to the central benzene ring by 44.43†(7) and 21.99†(8)°, respectively. In the crystal, mol-ecules are linked by N-H⋯O hydrogen bonds, weak C-H⋯O hydrogen bonds and weak C-H⋯π inter-actions into a three-dimensional supra-molecular network.