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The crystal structure of the title compound, C4H10N3O2+·C2HO4−, is stabilized by N—H...O and O—H...O hydrogen bonds. The anions are connected by an O—H...O hydrogen bond, leading to C(5) chain extending along c axis. The cations are dimerized around the corners of the unit cell, leading to an R22(14) ring motif. This leads to a cationic molecular aggregation at x = 0 or 1 and an anionic molecular aggregation at x = 1/2.