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In the title mol­ecular salt, C6H6NO2+.C4H3O4, the 2-carb­oxy­pyridinium cation is essentially planar with a maximum deviation of 0.003 (3) Å. In the crystal, adjacent cations and anions are linked by an extensive system of weak N—H...O, O—H...O and C—H...O inter­actions, forming a layer parallel to the ab plane.
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