2-亚甲基环戊酮

2-prop-2-enylcyclopentan-1-one

2-(3-methylbut-2-enyl)cyclohexan-1-one

methyl 2-oxo-1-propan-2-ylcyclopentane-1-carboxylate

ethyl 7-oxo-1,2,3,4,5,6-hexahydronaphthalene-4a-carboxylate