N1-((4S,5S,7R)-5-((tert-butyldimethylsilyl)oxy)-8-(((S)-1-(isopropylamino)-3-methyl-1-oxobutan-2-yl)amino)-2,7-dimethyl-8-oxooctan-4-yl)-N3-propylisophthalamide

tert-butyl (1S,2S,4R)-5-({(1S)-1-[(benzylamino)carbonyl]-2-methylpropyl}amino)-2-hydroxy-1-isobutyl-4-methyl-5-oxopentylcarbamate

{(S)-1-[(1S,2S,4R)-4-((S)-1-Benzylcarbamoyl-2-methyl-propylcarbamoyl)-2-hydroxy-1-isobutyl-pentylcarbamoyl]-3-methylsulfanyl-propyl}-carbamic acid tert-butyl ester

((S)-1-{(S)-1-[(1S,2S,4R)-4-((S)-1-Benzylcarbamoyl-2-methyl-propylcarbamoyl)-2-hydroxy-1-isobutyl-pentylcarbamoyl]-3-methylsulfanyl-propylcarbamoyl}-2-methyl-propyl)-carbamic acid tert-butyl ester

[(2R,4S,5S)-5-(N-Boc-amino)-4-hydroxy-2,7-dimethyloctanoyl] N'-isobutyl amide