O-(L-N-(benzyloxycarbonyl)-N,O-dimethyltyrosyl)-N-(tert-butoxycarbonyl)-L-serine

(3S,4R)-4-(tert-butoxycarbonylamino)-3-hydroxy-5-methylhexanoic acid methyl ester

(S)-1-((S)-2-{(S)-2-[(3S,4R)-4-tert-Butoxycarbonylamino-3-(tert-butyl-dimethyl-silanyloxy)-5-methyl-hexanoyloxy]-3-methyl-butyrylamino}-4-methyl-pentanoyl)-pyrrolidine-2-carboxylic acid benzyl ester

(3S,4R)-4-(tert-butoxycarbonylamino)-5-methyl-3-(tert-butyldimethylsilanyloxy)hexanoic acid