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The asymmetric unit of the title molecular salt, C6H10N2 2+·2H2PO3 −, contains half of a benzene-1,2-diaminium cation and a phosphite anion, the complete cation being generated by a crystallographic mirror plane. In the crystal, N—H...O hydrogen bonds generate R 2 2(9) and R 2 2(8) ring motifs and O—H...O hydrogen bonds generate an R 2 2(8) ring motif. Overall, these generate a three-dimensional framework. The crystal structure also features π–π interactions [centroid-to-centroid distance =doi:10.1107/s2414314616015911 fatcat:dfceuevmhbbrldtvtsikakxixe