(2R,4S,5S)-2-Allyl-5-tert-butoxycarbonylamino-4-(tert-butyl-dimethyl-silanyloxy)-6-phenyl-hexanoic acid

(S)-N-((1S,2S,4R)-1-Benzyl-2-hydroxy-4-isobutylcarbamoyl-hept-6-enyl)-2-tert-butoxycarbonylamino-succinamic acid benzyl ester

(S)-N-((1S,2S,4R)-1-Benzyl-2,7-dihydroxy-4-isobutylcarbamoyl-heptyl)-2-tert-butoxycarbonylamino-succinamic acid benzyl ester