5-(2-oxocyclopentyl)pentyl acetate

4-methyl-2,3-dihydro-1H-cyclopenta[b]indole

(2-cyclohexyliminocyclopentanecarbothioyl)sulfanyl 2-cyclohexyliminocyclopentane-1-carbodithioate

2-(Isopropylimino)cyclopentanone

2,2-dimethoxycyclopentan-1-ol