3,3′-(p-Phenyl­enedimethyl­ene)di-1H-imidazol-1-ium bis­(4-nitro­benzoate)–4-nitro­benzoic acid (1/2)

The asymmetric unit of the title compound, C₁₄H₁₆N₄²⁺·2C₇H₄NO₄⁻·2C₇H₅NO₄, comprises one-half of the 3,3′-(p-phenyl­enedimethyl­ene)di-1H-imidazol-1-ium dication, which lies on an inversion centre, one 4-nitro­benzoate anion and one 4-nitro­benzoic acid mol­ecule. In the crystal, the components are linked into a two-dimensional network parallel to (110) by O—H...O, N—H...O and C—H...O hydrogen bonds.