N-(N'-benzyl-N'-tert-butoxycarbonyl-5-aminopentyl)-N-tert-butoxycarbonyl-6-aminohexanoic acid

5-[5-(N-tert-Butoxycarbonyl-N-phenylmethylamino)-pentylamino]-pentan-1-ol

5-{[5-(Benzyl-tert-butoxycarbonyl-amino)-pentyl]-tert-butoxycarbonyl-amino}-pentanoic acid

Benzyl-{4-[benzyl-(3-{benzyl-[5-(benzyl-tert-butoxycarbonyl-amino)-pentanoyl]-amino}-2-oxo-propyl)-carbamoyl]-butyl}-carbamic acid tert-butyl ester

[4-(Benzyl-{3-[benzyl-(5-{[5-(benzyl-tert-butoxycarbonyl-amino)-pentyl]-tert-butoxycarbonyl-amino}-pentanoyl)-amino]-2-oxo-propyl}-carbamoyl)-butyl]-[5-(benzyl-tert-butoxycarbonyl-amino)-pentyl]-carbamic acid tert-butyl ester