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In the cation of the title mol­ecular salt, C5H6N3O2+·C2HO4, the dihedral angle between the aromatic ring and the nitro group is 3.5 (3)°; in the anion, the dihedral angle between the CO2 and CO2H planes is 10.5 (2)°. In the crystal, the anions are linked into [100] chains by O—H...O hydrogen bonds. The cations cross-link the chains by way of N—H...O hydrogen bonds and the structure is consolidated by C—H...O inter­actions.
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