2-氧代环戊烷羧酸甲酯

methyl 2-oxo-1-(3-oxobutyl)cyclopentane-1-carboxylate

2-环己酮甲酸乙酯

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

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