(1'S,3'R,4'R,5'R,7'S)-N2-isobutyryl-7-{4'-acetoxy-1'-phenyl-3'-(tert-butyldiphenylsilyloxymethyl)-2',6'-dioxabicyclo[3.3.0]oct-7'-yl}guanine

1,4-anhydro-2,3-O-isopropylidene-D-ribitol

2,3,5-TRI-O-BENZYL-β-L-ARABINO-FURANOSE

Trifluoro-methanesulfonic acid (4S,5R)-5-cyclohexylmethyl-2,2-dimethyl-[1,3]dioxolan-4-ylmethyl ester

5-O-Acetyl-2,3-O-isopropylidene-1-C-nitroso-D-ribofuranosyl chloride