(1S,3aR,6aS)-ethyl octahydrocyclopenta[c]pyrrole-1-carboxylate
(1S,3aR,6aS)-di-tert-butyl hexahydrocyclo-penta[c]pyrrol-1,2(1H)-dicarboxylate
(1S,3aR,6aS)-2-(tert-butoxycarbonyl)octahydrocyclo-penta[c]pyrrole-1-carboxylic acid
tert-butyl (1S,3aR,6aS)-octahydrocyclopenta[c]pyrrole-1-carboxylate oxalic acid salt