A new polymorph of N-(2-{N′-[(1E)-2-hy­droxy­benzyl­idene]hydrazinecarbon­yl}phen­yl)benzamide

The title compound, C(21)H(17)N(3)O(3), 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 tetra­gonal space group I4(1)/a. The bond lengths and angles are similar in both structures. The mol­ecule adopts an extended conformation via intra­molecular N—H⋯O and O—H⋯N hydrogen bonds; the terminal phenyl ring and the hy­droxy­lphenyl ring are twisted with respect to the central benzene ring by 44.43 (7) and 21.99 (8)°, respectively. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds, weak C—H⋯O hydrogen bonds and weak C—H⋯π inter­actions into a three-dimensional supra­molecular network.