N'-(2,3-Dihy-droxy-benzyl-idene)isonicotinohydrazide.

The title compound, C(13)H(11)N(3)O(3), crystallized with two independent mol-ecules in the asymmetric unit. One of the mol-ecules is twisted while the other is almost planar, with dihedral angles of 28.02†(6) and 2.42†(9)°, respectively, between the benzene and pyridine rings. Intra-molecular O-H⋯O and O-H⋯N hydrogen bonds are present in both mol-ecules. The two independent mol-ecules are linked by pairs of O-H⋯O hydrogen bonds. The crystal structure is further stabilized by inter-molecular N-H⋯N hydrogen bonds and C-H⋯N and C-H⋯O inter-actions.