[(S)-2-Methyl-1-((R)-5-oxo-tetrahydro-furan-2-yl)-propyl]-carbamic acid tert-butyl ester

(3S,4S)-4-(dibenzylamino)-5-methyl-1-(trimethylsilyl)hex-1-yn-3-ol

(4R,5S)-5-tert-Butoxycarbonylamino-4-(tert-butyl-dimethyl-silanyloxy)-6-methyl-heptanoic acid ethyl ester

(4R,5S)-4-(tert-Butyl-dimethyl-silanyloxy)-5-dibenzylamino-6-methyl-hept-2-ynoic acid ethyl ester

(4R,5S)-4-(tert-Butyl-dimethyl-silanyloxy)-5-dibenzylamino-6-methyl-hept-2-ynoic acid benzyl ester