1-[(2R,3R,4R,5S)-4-azido-3-fluoro-5-(trityloxymethyl)oxolan-2-yl]-5-methylpyrimidine-2,4-dione

1-[(2R,3S,5S)-3-hydroxy-5-(hydroxymethyl)oxolan-2-yl]-5-methylpyrimidine-2,4-dione

(2S,3R,5R)-2-[[tert-butyl(dimethyl)silyl]oxymethyl]-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolane-3-carbonitrile

(2S,3S,5R)-2-(hydroxymethyl)-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolane-3-carbonitrile

[(2R,3R,4R,5R)-5-(5-methyl-2,4-dioxopyrimidin-1-yl)-4-methylsulfonyloxy-2-(trityloxymethyl)oxolan-3-yl] methanesulfonate