1H-Pyrrolo[2,3-d]pyrimidine-5-carbonitrile, 2-amino-4,7-dihydro-7-[5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-arabinofuranosyl]-4-oxo-

4H-Pyrrolo[2,3-d]pyrimidin-4-one, 2-amino-1,7-dihydro-7-[5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-arabinofuranosyl]-

4H-Pyrrolo[2,3-d]pyrimidin-4-one, 2-amino-1,7-dihydro-7-[5-O-[hydroxy[[hydroxy(phosphonooxy)phosphinyl]oxy]phosphinyl]-β-D-arabinofuranosyl]-

7H-Pyrrolo[2,3-d]pyrimidin-2-amine, 4-chloro-7-[2-deoxy-2-fluoro-5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-arabinofuranosyl]-

4H-Pyrrolo[2,3-d]pyrimidin-4-one, 2-amino-7-[2-deoxy-2-fluoro-5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-arabinofuranosyl]-1,7-dihydro-

2-Amino-7-[2-deoxy-2-fluoro-5-O-[hydroxy[[hydroxy(phosphonooxy)phosphinyl]oxy]phosphinyl]-β-D-arabinofuranosyl]-3,7-dihydro-4H-pyrrolo[2,3-d]pyrimidin-4-one

9H-Purine, 6-methyl-9-[5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-ribofuranosyl]-

7H-Pyrrolo[2,3-d]pyrimidine-5-carbonitrile, 2-amino-4-chloro-7-[2-C-methyl-5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-ribofuranosyl]-

2-Amino-4-chloro-7-[5-O-[hydroxy[[hydroxy(phosphonooxy)phosphinyl]oxy]phosphinyl]-2-C-methyl-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidine-5-carbonitrile

9H-Purin-2-amine, 6-chloro-9-[5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-ribofuranosyl]-

1H-Pyrazolo[3,4-d]pyrimidin-4-amine, 1-[5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-ribofuranosyl]-

4H-Pyrazolo[3,4-d]pyrimidin-4-one, 1,5-dihydro-1-[5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-ribofuranosyl]-

1,5-Dihydro-1-[5-O-[hydroxy[[hydroxy(phosphonooxy)phosphinyl]oxy]phosphinyl]-β-D-ribofuranosyl]-4H-pyrazolo[3,4-d]pyrimidin-4-one

7H-Pyrrolo[2,3-d]pyrimidin-2-amine, 4-chloro-5-methyl-7-[5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-ribofuranosyl]-

7H-Pyrrolo[2,3-d]pyrimidin-2-amine, 4-chloro-7-[5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-ribofuranosyl]-

7H-Pyrrolo[2,3-d]pyrimidin-2-amine, 7-[5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-ribofuranosyl]-

7H-Pyrrolo[2,3-d]pyrimidin-2-amine, 4-chloro-7-[2-O-methyl-5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-ribofuranosyl]-

4H-Pyrrolo[2,3-d]pyrimidine-4-thione, 2-amino-1,7-dihydro-7-[2-O-methyl-5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-ribofuranosyl]-

7H-Pyrrolo[2,3-d]pyrimidin-2-amine, 4-chloro-5-methyl-7-[2-O-methyl-5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-ribofuranosyl]-

7H-Pyrrolo[2,3-d]pyrimidin-2-amine, 4-chloro-5-ethyl-7-[2-O-methyl-5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-ribofuranosyl]-