(3aR,4R,6R,6aR)-2,2-dimethyl-6-(trityloxymethyl)-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-4-ol

{(4S,5S)-5-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-2-trityloxy-ethyl]-2,2-dimethyl-[1,3]dioxolan-4-yl}-methanol

2,2-Dimethyl-propionic acid (4S,5R)-5-((R)-1-hydroxy-2-trityloxy-ethyl)-2,2-dimethyl-[1,3]dioxolan-4-ylmethyl ester

2,2-Dimethyl-propionic acid (4S,5S)-5-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-2-trityloxy-ethyl]-2,2-dimethyl-[1,3]dioxolan-4-ylmethyl ester