(Z)-(4,4-dimethyl-2-oxocyclopentylidene)methyl 2-hydroxy-4,4-dimethylcyclopentane-1-carboxylate

4,4-Dimethyl-1-cyclopentene-1-carboxylic acid

trans-2-hydroxy-4,4-dimethylcyclopentane-1-carboxylic acid