methyl (3aR,7aR)-2,2-dimethyl-7-oxo-3a,6,7,7a-tetrahydrobenzo[d][1,3]dioxole-5-carboxylate

methyl 5-hydroxycyclohexa-1,3-diene-1-carboxylate

(+/-)-methyl-5-β-O-t-butyldimethylsilyloxycyclohexa-1,3-dienoate