7-(5-oxocyclopent-2-en-1-yl)hept-5-enoic acid

2-(cis-Hept-2-en-7-saeure)-cyclopent-3-en-1-ol

重氮甲烷

2-[(Z)-6'-carboxy-2'-hexenyl]cyclopent-2-en-1-on

methyl-7-(2-methoxy-5-oxo-1-cyclopentenyl)-5(Z)-heptenoate