4,6-Dimeth­oxy-2-(methyl­sulfan­yl)pyrimidine–4-hy­droxy­benzoic acid (1/1)

The base mol­ecule of the title co-crystal, C₇H₁₀N₂O₂S·C₇H₆O₃, is essentially planar, with a maximum deviation of 0.0806 (14) Å for all non-H atoms. The acid mol­ecule is also nearly planar, with a dihedral angle of 8.12 (14)° between the benzene ring and the carb­oxy group. In the crystal, the acid mol­ecules form an inversion dimer through a pair of O—H...O hydrogen bonds with an R₂²(8) ring motif. The pyrimidine mol­ecules are linked on both sides of the dimer into a heterotetra­mer via O—H...N and C—H...O hydrogen bonds with R₂²(8) ring motifs. The heterotetra­mers are further linked by weak C—H...O hydrogen bonds, forming a tape structure along [1-10].