{(1R,3S,7R)-3,7-Bis-(tert-butyl-dimethyl-silanyloxy)-1-[(S)-1-(tert-butyl-dimethyl-silanyloxy)-2-hydroxy-ethyl]-8-phenyl-octyl}-carbamic acid tert-butyl ester

{(1R,3S,7R)-3,7-Bis-(tert-butyl-dimethyl-silanyloxy)-1-[(S)-1-(tert-butyl-dimethyl-silanyloxy)-2-trityloxy-ethyl]-8-phenyl-octyl}-carbamic acid tert-butyl ester

(R)-N-benzyl-4-<(methoxycarbonyl)methyl>-2-azetidinone

(R)-1-Benzyl-4-((S)-2,2-dimethyl-[1,3]dioxolan-4-yl)-azetidin-2-one

[(1R,3S,7R)-7-(tert-Butyl-dimethyl-silanyloxy)-1-((S)-1,2-dihydroxy-ethyl)-3-hydroxy-8-phenyl-octyl]-carbamic acid tert-butyl ester