N'-(2,3-Dimethoxy-benzyl-idene)-2,4-dihydroxy-benzohydrazide.

In the title compound, C(16)H(16)N(2)O(5), the dihedral angle between the two benzene rings is 8.5 (3)° and the mol-ecule adopts an E configuration with respect to the C=N bond. There is an intra-molecular N-H⋯O hydrogen bond in the mol-ecule, which generates an S(6) ring. In the crystal, mol-ecules are linked through inter-molecular O-H⋯O hydrogen bonds, forming layers parallel to the bc plane.