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In the cation of the title compound, C9H11N2O4+·ClO4−, the conformation is stabilized by an intramolecular N—H...O hydrogen bond. In the crystal packing, centrosymmetrically related cations interact through intermolecular O—H...O hydrogen bonds involving the carboxy groups, forming dimers. The dimers and the perchlorate anions are further linked into layers parallel to the ab plane by C—H...O and N—H...O hydrogen-bonding interactions.