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In the title ammonium carboxyl­ate–carb­oxy­lic acid co-cystal, C 10 H 9 N 2+ ·C 8 H 3 I 3 NO 4−. C 8 H 4 I 3 NO 4 , the carboxyl­ate anion and carb­oxy­lic acid mol­ecule are linked by O—H⋯O and N—H⋯O hydrogen bonds to form a chain running along the  c  axis of the monoclinic unit cell. The chains are linked by pyridinum and pyridine N—H⋯O hydrogen bonds, generating a layer motif. O—H⋯N and O—H⋯O hydrogen bonds are also observed.

4-(4-Pyridyl)pyridinium 3-amino-5-carboxy-2,4,6-triiodobenzoate–5-amino-2,4,6-triiodoisophthalic acid (1/1)