1-[(2R,4S,5R)-4-hydroxy-5-[[(4-methoxyphenyl)-diphenylmethoxy]methyl]oxolan-2-yl]-5-methylpyrimidine-2,4-dione

phenacyl 5'-thymidine carbonate

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

3',5'-bis-O-(tert-butyldiphenylsilyl)-thymidine