In the title compound, C 14 H 14 O 3 , the dihedral angle between the aromatic rings is 39.76 (9)°. In the crystal, the mol-ecules associate to form centrosymmetric acid-acid dimers linked by pairwise O-H⋯O hydrogen bonds. The precision of the geometric parameters in the present single-crystal study is about an order of magnitude better than the previous powder diffraction study [Chattopadhyay et al. (2013 ▸). CrystEngComm , 15 , 1077-1085].
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