diethyl 2-acetamido-2-(2-oxocyclopentyl)propanedioate

N-phenylcyclopentanethiocarboxamide

N-(cyclopentylmethyl)aniline

methyl 4,6-dimethyl-2,3-dihydro-1H-indene-5-carboxylate

2-pent-4-enoylcyclopentan-1-one