3,9-bis(3-(tert-butoxy)-3-oxopropyl)-6,12-bis(2-methoxyethyl)-15-((2-methoxyethyl)glycyl)-20,20-dimethyl-4,7,10,13,18-pentaoxo-19-oxa-3,6,9,12,15-pentaazahenicosanoic acid

hexa-tert-butyl 3,3',3'',3''',3'''',3'''''-(2,5,8,11,14,17-hexaoxo-1,4,7,10,13,16-hexaazacyclooctadecane-1,4,7,10,13,16-hexayl)hexapropionate

ethyl N-benzyloxycarbonyl-N-{(2-cyclopropylaminocarbonyl)ethyl}aminoacetate