2-Hydro­xy­cyclo­hexene-1-carboxyl­ic acid: the enol isomer of 2-oxo­cyclo­hexane-1-carboxyl­ic acid

There are four independent mol­ecules in the asymmetric unit of the title compound, C7H10O3, and two of the molecules are disordered. Molecules form two independent O—H⋯O hydrogen-bonded dimers, through the carboxyl groups, with O⋯O distances of 2.669 (3), 2.661 (3), 2.653 (3) and 2.654 (3) A. Each hydrogen-bonded dimer contains a disordered mol­ecule.