1-Boc-(3aS,6aS)-octahydropyrrolo[3,4-b]pyrrole; (3aS,6aS)-rel-tert-Butyl hexahydropyrrolo[3,4-b]pyrrole-1(2H)-carboxylate; rel-tert-butyl (3aS,6aS)-octahydropyrrolo[2,3-c]pyrrole-1-carboxylate;