(1S,3R,4R,5R)-4-acetoxy-1-phenyl-3-(tert-butyldiphenylsilyloxymethyl)-2,6-dioxabicyclo[3.3.0]octane

(1S,3R,4R,5R)-4-hydroxy-3-hydroxymethyl-1-phenyl-2,6-dioxabicyclo[3.3.0]octane

(1'S,3'R,4'R,5'R,7'S)-(4'-hydroxy-3'-hydroxymethyl-1'-phenyl-2',6'-dioxabicyclo[3.3.0]oct-7'-yl)thymine

(1'S,3'R,4'R,5'R,7'R)-N4-benzoyl-1-(4'-hydroxy-3'-hydroxymethyl-1'-phenyl-2',6'-dioxabicyclo[3.3.0]oct-7'-yl)cytosine

(1'S,3'R,4'R,5'R,7'S)-N4-benzoyl-1-(4'-hydroxy-3'-hydroxymethyl-1'-phenyl-2',6'-dioxabicyclo[3.3.0]oct-7'-yl)cytosine