4H-Imidazo[4,5-c]pyridin-4-one, 6-amino-1-[2-deoxy-5-O-[7-methyl-1-[[[(1-methylethoxy)carbonyl]oxy]methoxy]-1-oxido-5-oxo-2,4,6-trioxa-1-phosphaoct-1-yl]-β-D-erythro-pentofuranosyl]-1,5-dihydro-

6-Amino-1-[2-deoxy-5-O-[hydroxy[[hydroxy(phosphonooxy)phosphinyl]oxy]phosphinyl]-β-D-erythro-pentofuranosyl]-1,5-dihydro-4H-imidazo[4,5-c]pyridin-4-one

4H-Imidazo[4,5-c]pyridin-4-one, 6-amino-1,5-dihydro-1-[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-Imidazo[4,5-c]pyridin-4-one, 6-amino-1-[5-O-[hydroxy[[hydroxy(phosphonooxy)phosphinyl]oxy]phosphinyl]-2-O-methyl-β-D-ribofuranosyl]-1,5-dihydro-

4H-Pyrrolo[2,3-d]pyrimidin-4-one, 2-amino-7-[3-deoxy-3-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-ribofuranosyl]-1,7-dihydro-

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

4H-Pyrrolo[2,3-d]pyrimidin-4-one, 2-amino-7-[3-deoxy-3-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]-1,7-dihydro-

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

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

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-ribofuranosyl]-

7H-Pyrrolo[2,3-d]pyrimidine-5-carbonitrile, 2-amino-7-[3-deoxy-3-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-7-[3-deoxy-5-O-[hydroxy[[hydroxy(phosphonooxy)phosphinyl]oxy]phosphinyl]-3-methyl-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidine-5-carbonitrile

4H-Pyrrolo[2,3-d]pyrimidin-4-one, 2-amino-1,7-dihydro-5-iodo-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]-

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

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

1H-Pyrrolo[2,3-d]pyrimidine-5-carbonitrile, 2-amino-7-[3-deoxy-5-O-[hydroxy[[hydroxy(phosphonooxy)phosphinyl]oxy]phosphinyl]-β-D-erythro-pentofuranosyl]-4,7-dihydro-4-oxo-

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-ribofuranosyl]-1,7-dihydro-

5′-Guanylic acid, 2′-deoxy-, bis[[[(1-methylethoxy)carbonyl]oxy]methyl] ester

5′-Guanylic acid, 2′-deoxy-2′-fluoro-, bis[[[(1-methylethoxy)carbonyl]oxy]methyl] ester

5′-Guanylic acid, 2′-O-[4-(1H-imidazol-1-yl)butyl]-, bis[[[(1-methylethoxy)carbonyl]oxy]methyl] ester