5'S-amino-5'-diethylphosphonyl-2',3'-di-O-tert-butyldimethylsilyl uridine

5'R-(p-methoxybenzyl)amino-5'-diethylphosphonyl-2',3'-di-O-t-butyldimethylsilyl uridine

(2R,3S)-3-[(2R,3R,4R,5R)-3,4-Bis-(tert-butyl-dimethyl-silanyloxy)-5-(2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-2-yl]-oxirane-2-carboxylic acid tert-butyl ester

1-{(2R,3R,4R,5R)-3,4-Bis-(tert-butyl-dimethyl-silanyloxy)-5-[(2S,3R)-3-(indole-1-carbonyl)-oxiranyl]-tetrahydro-furan-2-yl}-1H-pyrimidine-2,4-dione

1-{(2R,3R,4R,5R)-3,4-Bis-(tert-butyl-dimethyl-silanyloxy)-5-[(2R,3R)-3-(2,3-dihydro-indole-1-carbonyl)-oxiranyl]-tetrahydro-furan-2-yl}-1H-pyrimidine-2,4-dione