methyl 8-oxooct-4-enoate

辛-4-烯-1,8-二醛

butyl 8-(5-oxocyclopenten-1-yl)oct-4-enoate

decyl 8-(5-oxocyclopenten-1-yl)oct-4-enoate

methyl 6-(5-oxocyclopenten-1-yl)hex-4-enoate