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The asymmetric unit of the title compound, 2C8H9N2+·C10H6O6S22−, contains a 2-methyl­benzimidazolium cation and one half of a naphthalene-1,5-disulfonate anion. The formula unit is generated by an inversion center. In the crystal, N—H...O hydrogen bonds link the components into chains along [001]. In addition, weak C—H...O hydrogen bonds and weak C—H...π inter­actions are observed. The methyl H atoms were refined as disordered over two sets of sites with equal occupancy.
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