In the title compound, C11H14O3, the pendant –OCH2COOH chain is in an extended conformation and almost lies in the plane of the benzene ring, as indicated by the dihedral angle of 2.61 (5)°. In the crystal, molecules are linked by a pair of O—H...O hydrogen bonds, forming classical carboxylic acid inversion dimers, with an R22(8) loop. The crystal structure of this compound have been reported previously [Smith et al. (1992). Aust. J. Chem. 45, 1101–1108], however, in that report, the unit-cell dimensions differ significantly from those of the title structure and the carboxyl H atom was disordered within a cyclic hydrogen-bonded dimer.
