[[3-[2-Amino-7-(2-deoxy-β-D-erythro-pentofuranosyl)-4,7-dihydro-4-oxo-3H-pyrrolo[2,3-d]pyrimidin-5-yl]-2-propyn-1-yl]oxy]methyl 4-methylbenzenesulfonothioate

[[3-[4-Amino-7-(2-deoxy-β-D-erythro-pentofuranosyl)-7H-pyrrolo[2,3-d]pyrimidin-5-yl]-2-propyn-1-yl]oxy]methyl 4-methylbenzenesulfonothioate

[[3-[1-[2-Deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-erythro-pentofuranosyl]-1,2,3,4-tetrahydro-2,4-dioxo-5-pyrimidinyl]-2-propyn-1-yl]oxy]methyl 4-methylbenzenesulfonothioate

[[3-[4-Amino-1-[2-deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-erythro-pentofuranosyl]-1,2-dihydro-2-oxo-5-pyrimidinyl]-2-propyn-1-yl]oxy]methyl 4-methylbenzenesulfonothioate

[[3-[2-Amino-7-[2-deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-erythro-pentofuranosyl]-4,7-dihydro-4-oxo-3H-pyrrolo[2,3-d]pyrimidin-5-yl]-2-propyn-1-yl]oxy]methyl 4-methylbenzenesulfonothioate

[[3-[4-Amino-7-[2-deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-erythro-pentofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-5-yl]-2-propyn-1-yl]oxy]methyl 4-methylbenzenesulfonothioate

2-Amino-7-[2-deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-erythro-pentofuranosyl]-3,7-dihydro-5-[3-[(methylthio)methoxy]-1-propyn-1-yl]-4H-pyrrolo[2,3-d]pyrimidin-4-one

7-[2-Deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-erythro-pentofuranosyl]-5-[3-[(methylthio)methoxy]-1-propyn-1-yl]-7H-pyrrolo[2,3-d]pyrimidin-4-amine

2-Amino-7-[2-deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-erythro-pentofuranosyl]-3,7-dihydro-5-(3-hydroxy-1-propyn-1-yl)-4H-pyrrolo[2,3-d]pyrimidin-4-one

3-[4-Amino-7-[2-deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-erythro-pentofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-5-yl]-2-propyn-1-ol

2-Amino-7-[2-deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-erythro-pentofuranosyl]-3,7-dihydro-5-iodo-4H-pyrrolo[2,3-d]pyrimidin-4-one