Toluene-4-sulfonic acid (R)-2-(tert-butyl-dimethyl-silanyloxy)-1-[(3aR,5S,6S,6aR)-6-(1-ethoxy-ethoxy)-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl]-ethyl ester

1,2-O-isopropylidene-5-O-tosyl-α-D-glucuronolactone

(4'R)-6-O-t-butyldimethylsilyl-5-deoxy-3-O:5-C-(azetidin-2'-on-1',4'-diyl)-1,2-O-isopropylidene-β-L-idofuranose

Toluene-4-sulfonic acid (R)-2-(tert-butyl-dimethyl-silanyloxy)-1-((3aR,5S,6S,6aR)-6-hydroxy-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl)-ethyl ester

Toluene-4-sulfonic acid (R)-2-(tert-butyl-dimethyl-silanyloxy)-1-((3aR,5S,6S,6aR)-2,2-dimethyl-6-vinyloxy-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl)-ethyl ester