In the title mol-ecular salt, C(6)H(6)NO(2) (+) (.)C(4)H(3)O(4) (-), the 2-carb-oxy-pyridinium 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 inter-actions, forming a layer parallel to the ab plane.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3515186 | PMC |
| http://dx.doi.org/10.1107/S1600536812041177 | DOI Listing |
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