甲基7-(5-氧代-1-环戊烯-1-基)庚酸酯

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

ethyl 7-(3-acetyloxy-5-oxocyclopenten-1-yl)heptanoate

5-氧代环戊-1-烯-1-庚酸

2-(2-carboxyethyl)-2-cyclopenten-1-one