methyl 8-(5-oxocyclopenten-1-yl)octanoate

ethyl 1-(3-bromopropyl)-2-oxocyclopentane-1-carboxylate

5-(2-oxocyclopentyl)pentyl-triphenylphosphanium,bromide

1,2,3,3a,4,5,6,7-octahydroazulene

(3-氧代-2-戊基环戊基)丙二酸二甲酯