Abstract
The anion in the structure of the title compound, C7H7N2+·H+·2C9H7O5−, has a CO2H unit on the aromatic ring. Two anions are linked through an `acid H' atom (which lies on a center of inversion) to give a monoanionic entity. Adjacent entities are linked into a linear chain through hydrogen bonding involving the CO2H units. The chains are connected into a layer structure through the benzimidazolium cations, which possess C2 symmetry.
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