6,7-二氢-5H-环戊并[c]吡啶

2-morpholin-4-ylcyclopentan-1-one

2-(phenylsulfanylmethyl)cyclopentan-1-one

5-氧代环戊-1-烯-1-庚酸丁酯

methyl 2,3-dihydro-1H-cyclopenta[a]azulene-9-carboxylate