Tert-butyl 6-aminohexahydro-1H-cyclopenta[c]pyridine-2(3h)-carboxylate
Tert-butyl 6-oxohexahydro-1H-cyclopenta[c]pyridine-2(3h)-carboxylate
Octahydrospiro[cyclopenta[c]pyridine-6,2'-[1,3]dioxolane]
Tetrahydro-1H-cyclopenta[c]pyridine-3,6(2h,4h)-dione