甲基7-(5-氧代-1-环戊烯-1-基)庚酸酯

乙基5-氧代-1-环戊烯-1-羧酸酯

ethyl 9-(5-oxocyclopenten-1-yl)nonanoate

ethyl 6-(5-oxocyclopenten-1-yl)hexanoate

5-氧代环戊-1-烯-1-庚酸