[(2R,3S,5R)-3-hydroxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methyl acetate

5'-O-(4,4'-dimethoxytrityl)-3'-mesyl-2',3'-dideoxythymidine

1-((2R,4R,5R)-5-((bis(4-methoxyphenyl)(phenyl)methoxy)methyl)-4-(phenylselanyl)tetrahydrofuran-2-yl)-5-methylpyrimidine-2,4(1H,3H)-dione

5'-O-[(1,1-Dimethylethyl)-dimethylsilyl]-3'-O-(phenoxythioxomethyl)thymidine