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

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

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

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

1-[(2R,3S,3aR,6aS)-3,4-dihydroxy-2,3,3a,4,6,6a-hexahydrofuro[2,3-c]furan-2-yl]-5-methylpyrimidine-2,4-dione