(2R,4S,5S)-5-[(tert-butoxycarbonyl)amino]-4-[(tert-butyldimethylsilyl)oxy]-2,7-dimethyloctanoic acid

(4S,5S)-N-Boc-5-(2-cyanoethyl)-2,2-dimethyl-4-(2-methylpropyl)-1,3-oxazolidine

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

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

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