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There are two molecules in the asymmetric unit of the title compound, C10H12N2O3, with identical conformations. Each independent molecule is approximately planar and adopts a trans configuration with respect to the C=N double bond. Intramolecular O—H...N hydrogen bonds are observed in both molecules. The molecules are linked into a ribbon-like structure running along the b axis by intermolecular N—H...O and C—H...O hydrogen bonds. The ribbons are arranged into layers parallel to (overline{3}02).