The molecule of the title compound, C14H11N3O5, assumes an E configuration with respect to the methylidene unit. An intramolecular O—H⋯O hydrogen bond is present in the molecule. The dihedral angle between the mean planes of the two benzene rings is 5.46 (15)°. The crystal structure is stabilized by intermolecular O—H⋯O, O—H⋯N, and N—H⋯O hydrogen bonds
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