(3aR,5S,6aR)-2,2-dimethyl-5-[(2R)-oxiran-2-yl]-3a,5,6,6a- tetrahydrofuro[2,3-d] [1,3]dioxole

(3S,4S)-4-Azido-3-(tert-butyl-dimethyl-silanyloxy)-6-methyl-heptanoic acid

(2R,3S)-5-Methyl-2,3-dihydroxyhexanoate ethyl ester

(2R,3S)-3-Azido-2-(tert-butyl-dimethyl-silanyloxy)-5-methyl-hexanoic acid

(3R,4S)-4-Azido-3-(tert-butyl-dimethyl-silanyloxy)-1-diazo-6-methyl-heptan-2-one