Zwitterionic 4-carb­oxy-2-(1-methyl­pyridin-1-ium-4-yl)-1H-imidazole-5-carboxyl­ate

In the title zwitterionic mol­ecule, C₁₁H₉N₃O₄, the imidazole and pyridine rings form a dihedral angle of 2.60 (2)°. An intra­molecular O—H...O hydrogen bond occurs. In the crystal, pairs of N—H...O hydrogen bonds link the mol­ecules into inversion dimers. Weak inter­molecular C—H...O inter­actions further consolidate the crystal packing.