(2R,3S,4S,5R)-2-azido-2-((isobutyryloxy)methyl)-4-methyl-5-(2-oxo-4-(1H-1,2,4-triazol-1-yl)pyrimidin-1(2H)-yl)tetrahydrofuran-3-yl isobutyrate

1-((2R,3S,4S,5R)-4-((tert-butyldimethylsilyl)oxy)-5-(hydroxymethyl)-5-methoxy-3-methyltetrahydrofuran-2-yl)pyrimidine-2,4(1H,3H)-dione

1-((2R,3S,4S)-4-((tert-butyldimethylsilyl)oxy)-3-methyl-5-methylenetetrahydrofuran-2-yl)pyrimidine-2,4(1H,3H)-dione

1-((3S,5R,6S,7S)-7-((tert-butyldimethylsilyl)oxy)-6-methyl-1,4-dioxaspiro[2.4]heptan-5-yl)pyrimidine-2,4(1H,3H)-dione