{(3aR,5S,6R,6aR)-5-[(R)-2-(tert-Butyl-diphenyl-silanyloxy)-1-hydroxy-ethyl]-2,2-dimethyl-6-vinyl-tetrahydro-furo[2,3-d][1,3]dioxol-6-yl}-acetic acid ethyl ester

{(3aR,5S,6R,6aR)-5-[(R)-2-(tert-Butyl-diphenyl-silanyloxy)-1-methanesulfonyloxy-ethyl]-2,2-dimethyl-6-vinyl-tetrahydro-furo[2,3-d][1,3]dioxol-6-yl}-acetic acid ethyl ester

(S)-2-(tert-Butyl-diphenyl-silanyloxy)-1-{(3aR,5S,6R,6aR)-6-[2-(tert-butyl-diphenyl-silanyloxy)-ethyl]-2,2-dimethyl-6-vinyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl}-ethanol