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The title structure, C6H9.5N3O20.5+·C7H6.5NO20.5−, which might be named schematically as 2-amino-4,6-dimethoxypyrimidine-(μ2-hydrogen)-4-aminobenzoate to indicate a bridging H atom, has been redetermined from the data published by Thanigaimani, Muthiah & Lynch [Acta Cryst. (2006), E62, o2976–o2978]. The improvement of the present redetermination consists in a released geometry of the primary amine groups, which were originally assumed to be planar, as well as in a redetermination of the position of the hydroxy H atom. This H atom, whose parameters were originally constrained, turns out to be situated about the centre of the O...N hydrogen bond in two disordered positions with occupancies of 0.5 each.