甲基7-(5-氧代-1-环戊烯-1-基)庚酸酯

3-苄基-2-羟基环戊烯-2-酮

2-(3-methylphenyl)cyclopent-2-en-1-one

2-(4-methoxyphenyl)cyclopent-2-en-1-one

methyl 7-(1-hydroxy-2-oxocyclopentyl)heptanoate