2-(4-carbethoxybutyl)cyclopentane-1-one

7-(5-methoxyiminocyclopenten-1-yl)heptanoic acid

乙基5-氧代-1-环戊烯-1-羧酸酯

1-methoximino-2-(6-carbethoxyhexyl)-2-cyclopentene

1-acetoxy-2-(4-carbethoxybutyl)cyclopent-1-ene