methyl 1-(3-methylbut-2-enyl)-2-oxocyclopentanecarboxylate

methyl 2-acetoxy-1-(3-methylbut-2-enyl)cyclopent-2-enecarboxylate

ethyl 1-(3-methylbut-2-enyl)-2-trimethylsilyloxycyclohexanecarboxylate

2-氧代环戊烷羧酸甲酯

1-吡咯烷-1-环己烯