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In the title cocrystal, C6H9N3O2·C7H7NO2, the 2-amino-4,6-dimethoxypyrimidine molecule interacts with the carboxyl group of the 4-aminobenzoic acid molecule through N—H...O and O—H...N hydrogen bonds, forming a cyclic hydrogen-bonded motif [R 2 2(8)]. This motif further self-organizes through N—H...O hydrogen bonds to generate an array of six hydrogen bonds with the rings having the graph-set notation R 2 3(6), R 2 2(8), R 4 2(8), R 2 2(8) and R 2 3(6). The 4-aminobenzoic acid molecules self-assemble via N—H...O hydrogen bonds to form a supramolecular chain along the c axis.

The asymmetric unit of the title compound, C6H10N3O2+·C7H5O3−, contains one 2‐amino‐4,6‐dimethoxypyrimidinium cation and a salicylate anion. The 2‐amino‐4,6‐dimethoxypyrimidinium cation interacts with the carboxylate group of the salicylate anion through a pair of nearly parallel N—H...O hydrogen bonds, forming an R22(8) ring motif. These motifs are centrosymmetrically paired via N—H...O hydrogen bonds, forming a complementary DDAA array. The typical intramolecular O—H...O hydrogen bond is observed in the anion. The salicylate ions form a hydrogen‐bonded supramolecular chain along the c axis via C—H...O hydrogen bonds involving a benzene hydrogen and one of the O atoms of the carboxylate group.

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Key indicators: single-crystal X-ray study; T = 120 K; mean (C-C) = 0.002 Å; R factor = 0.041; wR factor = 0.114; data-to-parameter ratio = 15.8. organic compounds o4212 # 2007 International Union of Crystallography

In the crystal structures of 2-amino-4,6-dimethoxypyrimidinium 2,4,6-trinitrophenolate (picrate), C(6)H(10)N(3)O(2)(+).C(6)H(2)N(3)O(7)(-), (I), and 2,4-diamino-5-(4-chlorophenyl)-6-ethylpyrimidin-1-ium (pyrimethaminium or PMN) picrate dimethyl sulfoxide solvate, C(12)H(14)ClN(4)(+).C(6)H(2)N(3)O(7)(-).C(2)H(6)OS, (II), the 2-amino-4,6-dimethoxypyrimidine and PMN cations are protonated at one of the pyrimidine N atoms. The picrate anion interacts with the protonated cations through bifurcated N-H...O hydrogen bonds, forming R(2)(1)(6) and R(1)(2)(6) ring motifs. In (I), Z' = 2. In (II), two inversion-related PMN cations are connected through a pair of N-H...N hydrogen bonds involving the 4-amino group and the uncharged N atom of the pyrimidine ring, forming a cyclic hydrogen-bonded R(2)(2)(8) motif. In addition to the pairing, the O atom of the dimethyl sulfoxide solvent molecule bridges the 2-amino and 4-amino groups on both sides of the paired bases, resulting in a self-complementary ...DADA... array of quadruple hydrogen-bonding patterns.