5-benzyl-1,2,3,3a,4,9b-hexahydrocyclopenta[c]quinoline

3-ethenoxycyclopentene

2-iodocyclopentan-1-one

3-乙基-1-环戊烯

3-methylidene-4,6a-dihydro-3aH-cyclopenta[b]furan-2-one