The mol-ecule of the title compound, C16H16N2O4, adopts an E conformation about the azomethine C=N double bond. The dihedral angle formed by the benzene rings is 18.88 (9)°. The mol-ecular conformation is stabilized by an intra-molecular O-H⋯N hydrogen bond, which forms an S(6) ring. In the crystal, the mol-ecules are linked into chains parallel to [001] by N-H⋯O hydrogen bonds. The chains are further connected into a three-dimensional network by π-π stacking inter-actions with centroid-centroid distances of 3.6538 (10) and 3.8995 (11) Å.