4,4'-bis[1,3-di(tert-butoxycarbonyl)-2-imidazolidinylimino]diphenylamine
4,4'-bis[1,3-di(tert-butoxycarbonyl)-2-imidazolidinylimino]diphenylketone
di-tert-butul 2-(4-[4-(4-[1,3-bis(tert-butoxycarbonyl)tetrahydro-1H-2-imidazolyliden]aminophenyl)piperazino]phenylimino)-1,3-imidazolidinedicarboxylate
1-[1,3-di(tert-butoxycarbonyl)-2-imidazolidinylimino]-4-benzylbenzene
4,4'-bis[1,3-di(tert-butoxycarbonyl)-2-imidazolidinylimino]-1,2-diphenylethane