7H-Pyrrolo[2,3-d]pyrimidine-5-carbonitrile, 2-amino-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]-

7H-Pyrrolo[2,3-d]pyrimidine-5-carboxamide, 4-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]-

5′-Guanylic acid, 8-bromo-, bis[[[(1-methylethoxy)carbonyl]oxy]methyl] ester

5′-Adenylic acid, 8-amino-, bis[[[(1-methylethoxy)carbonyl]oxy]methyl] ester

5′-Adenylic acid, 8-bromo-, bis[[[(1-methylethoxy)carbonyl]oxy]methyl] ester

5′-Guanylic acid, 8-amino-, bis[[[(1-methylethoxy)carbonyl]oxy]methyl] ester

5′-Guanylic acid, 8-azido-, bis[[[(1-methylethoxy)carbonyl]oxy]methyl] ester

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

1H-Pyrrolo[2,3-d]pyrimidine-5-carbonitrile, 2-amino-4,7-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]-4-oxo-

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

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

4H-Pyrrolo[2,3-d]pyrimidin-4-one, 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]-

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

4H-Pyrrolo[3,2-c]pyridin-4-one, 6-amino-1-[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]-1,5-dihydro-

6-Amino-1-[3-deoxy-5-O-[hydroxy[[hydroxy(phosphonooxy)phosphinyl]oxy]phosphinyl]-β-D-erythro-pentofuranosyl]-1,5-dihydro-4H-pyrrolo[3,2-c]pyridin-4-one

4H-Imidazo[4,5-c]pyridin-4-one, 6-amino-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]-

4H-Pyrrolo[2,3-d]pyrimidin-4-one, 2-amino-5-ethyl-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]-

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-ribofuranosyl]-4-oxo-

7H-Pyrrolo[2,3-d]pyrimidine-5-carboxamide, 4-amino-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]-