Acta Cryst. (2012). E68, o3081 [ doi:10.1107/S1600536812041177 ]
Abstract: 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-HO, O-HO and C-HO interactions, forming a layer parallel to the ab plane.
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