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In the title compound, C15H14N2O4, the dihedral angle between the benzene rings is 40.59 (4)° and an intramolecular O—H...N hydrogen bond generates an S(6) ring. In the crystal, N—H...O, O—H...O and C—H...O interactions link the molecules into a three-dimensional network.

In the title compound, C15H14N2O3, the dihedral angle between the benzene rings is 66.56 (5)°. In the crystal, N—H...O, O—H...O and C—H...O interactions link the molecules into a three-dimensional network. A π–π interaction, with a centroid–centroid distance of 3.628 (6) Å, helps to establish the packing.