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The molecule of the title compound, C6H7N3O2, a derivative of o-phenylenediamine, nearly shows non-crystallographic Cs symmetry. C—C—C angles span the range 116.25 (11)–122.35 (11)°. In the crystal, intermolecular N—H...O and N—H...N hydrogen bonds connect molecules into undulating sheets perpendicular to the crystallographic a axis. A weak intramolecular N—H...O hydrogen bond is also observed. No π-stacking is observed in the crystal structure.