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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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