5-O-(tert-butyldiphenylsilyl)-2,3-O-isopropylidene-1-phenyl-D-ribofuranose

(1R,3R,4R,5R,7RS)-1-phenyl-3-(tert-butyldiphenylsilyloxymethyl)-4,7-diacetoxy-2,6-dioxabicylco[3.3.0]octane

(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

phenyl 2,3-O-isopropylidene-1-thio-α-D-ribofuranoside

(1'S,3'R,4'R,5'R,7'R)-N2-isobutyryl-9-{4'-acetoxy-1'-phenyl-3'-(tert-butyldiphenylsilyloxymethyl)-2',6'-dioxabicyclo[3.3.0]oct-7'-yl}guanine