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The title compound, C15H14O2, was obtained by Friedel–Crafts acyl­ation between 2,5-dimethyl­phenol and benzoyl chloride in the presence of aluminium chloride as a catalyst. The dihedral angle between the benzene rings is 61.95 (4)°. In the crystal, O—H⋯O hydrogen bonding and C—H⋯O weak inter­actions lead to polymeric C(6), C(8) and C(11) chains along the a, b and c-axis directions, respectively.

In the title compound, C12H9NO3S, the dihedral angle between the pyridine and benzene rings is 83.93 (7)°. In the crystal, pairs of O—H⋯O hydrogen bonds link the molecules, forming inversion dimers with graph-set notation R 2 2(22). These dimers are in turn linked by weak C—H⋯O hydrogen bonds along [100], forming R 2 2(8) rings.