Toluene-4-sulfonic acid (3aS,4R,6R,7R,7aR)-2,2-dimethyl-4-phenylsulfanyl-7-triisopropylsilanyloxy-tetrahydro-[1,3]dioxolo[4,5-c]pyran-6-ylmethyl ester

(2R,3R,4S,5R)-3,4-Bis-(tert-butyl-dimethyl-silanyloxy)-6-fluoro-2-methyl-5-phenylsulfanyl-tetrahydro-pyran