(1S,3R,4S,7S)-7-benzyloxy-1-(methanesulfonyloxymethyl)-3-(thymin-1-yl)-2,5-dioxabicyclo[2.2.1]heptane

(1R,3R,4S,7S)-7-benzyloxy-1-(hydroxymethyl)-3-(thymin-1-yl)-2,5-dioxabicyclo[2.2.1]heptane

(1R,3R,4R,7S)-7-hydroxy-1-hydroxymethyl-3-(thymin-1-yl)-2-oxa-5-azabicyclo[2.2.1]heptane

(1R,3R,4R,7S)-1-(4,4'-dimethoxytrityloxymethyl)-7-hydroxy-5-N-methyl-3-(4-amino-5-methyl-cytosine-1-yl)-2-oxa-5-azabicyclo[2:2:1]heptane

Acetic acid (1R,3R,4R,7S)-1-[bis-(4-methoxy-phenyl)-phenyl-methoxymethyl]-5-methyl-3-(5-methyl-2-oxo-4-[1,2,4]triazol-1-yl-2H-pyrimidin-1-yl)-2-oxa-5-aza-bicyclo[2.2.1]hept-7-yl ester