Isonicotinonitrile-4-methyl-benzoic acid (1/1).

The title structure, C6H4N2·C8H8O2, is built up from an assembly of isonicotinonitrile and 4-methyl­benzoic acid mol­ecules and may be regarded as a co-crystal. The two planar mol­ecules [r.m.s. deviations of 0.002 (6) and 0.0028 (11) A, respectively] are linked by O—H⋯N and C—H⋯O hydrogen bonds. They are nearly coplanar and only twisted from each other by a dihedral angle of 2.48 (6)°. In the crystal, the components are inter­connected by slipped π–π stacking [centroid–centroid distance = 3.6797 (11), slippage = 1.304 A] and inter­molecular C—H⋯N inter­actions.