Cyclohexane-1,4-dicarboxylic acid–pyridinium-4-olate (1/1)

In the title adduct, C5H5NO·C8H12O4, the heterocycle exists in its zwitterionic form. The cyclohexane ring exhibits a chair conformation with the carboxylic acid groups in equatorial and axial orientations. In the crystal, molecules are linked through charge-assisted O—H...O−, N+—H...O− and N+—H...O hydrogen bonds, and an additional series of C—H...O contacts, giving a pleated two-dimensional hydrogen-bonded network parallel to (-204)