(1R,3R,5R,8R)-5,8-Bis(benzyloxy)-3-(thymin-1-yl)-2-oxabicyclo[3.3.0]octane

(1R,3R,4R,5R,8R)-5,8-Bis(benzyloxy)-4-pentafluorophenoxythiocarbonyloxy-3-(thymin-1-yl)-2-oxabicyclo[3.3.0]oct-6-ene