(2R,3R,4S,5S)-5-(((tert-butyldiphenylsilyl)oxy)methyl)-2-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-5-(((methylsulfonyl)oxy)methyl)-4-(naphthalen-2-ylmethoxy)tetrahydrofuran-3-yl acetate