N′-(2,3-Dimethoxy­benzyl­idene)-2,4-dihydroxy­benzohydrazide

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 mol­ecule adopts an E configuration with respect to the C=N bond. There is an intra­molecular N—H⋯O hydrogen bond in the mol­ecule, which generates an S(6) ring. In the crystal, mol­ecules are linked through inter­molecular O—H⋯O hydrogen bonds, forming layers parallel to the bc plane.