| Summary: | The asymmetric unit of the title compound, C13H10N2O4, contains two crystallographically independent molecules. The aromatic rings are oriented at dihedral angles of 24.39 (3) and 7.47 (3)° in the two molecules and intramolecular N—H...O and O—H...O hydrogen bonds result in the formation of two planar six-membered rings. In the crystal structure, intermolecular O—H...O and C—H...O hydrogen bonds link the molecules into chains, forming R22(10) ring motifs. Weak π–π contacts between the benzene and phenyl rings [centroid–centroid distance = 3.955 (3) Å] may further stabilize the structure.
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