1,3-Bis(1,1-dimethylethyl) 2-[7-[(3aR,4R,6R,6aR)-tetrahydro-2,2-dimethyl-6-[[[(4-methylphenyl)sulfonyl]oxy]methyl]-4H-cyclopenta-1,3-dioxol-4-yl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]imidodicarbonate

N,N-Dimethyl-N′-[2-methyl-7-[2,3-O-(1-methylethylidene)-5-O-[(4-methylphenyl)sulfonyl]-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]methanimidamide

N′-[2-Chloro-7-[2,3-O-(1-methylethylidene)-5-O-[(4-methylphenyl)sulfonyl]-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]-N,N-dimethylmethanimidamide

N,N-Dimethyl-N′-[7-[2,3-O-(1-methylethylidene)-5-O-[(4-methylphenyl)sulfonyl]-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]methanimidamide

1,3-Bis(1,1-dimethylethyl) 2-[6-iodo-7-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]imidodicarbonate

1,3-Bis(1,1-dimethylethyl) 2-[7-[(3aS,4R,6R,6aR)-tetrahydro-6-(hydroxymethyl)-2,2-dimethyl-4H-cyclopenta-1,3-dioxol-4-yl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]imidodicarbonate

N,N-Dimethyl-N′-[2-methyl-7-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]methanimidamide

N′-[2-Chloro-7-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]-N,N-dimethylmethanimidamide

N,N-Dimethyl-N′-[7-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]methanimidamide

7-[5-O-[(1,1-Dimethylethyl)dimethylsilyl]-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-6-iodo-7H-pyrrolo[2,3-d]pyrimidin-4-amine

2-Methyl-7-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-amine

2-Chloro-7-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-amine

4-Chloro-5-fluoro-7-[2,3-O-(1-methylethylidene)-5-O-[(4-methylphenyl)sulfonyl]-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidine

4-Chloro-7-[2,3-O-(1-methylethylidene)-5-O-[(4-methylphenyl)sulfonyl]-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidine

4-Chloro-6-methyl-7-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidine

4-Chloro-5-methyl-7-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidine

4-Chloro-2-methyl-7-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidine

2,4-Dichloro-7-[2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidine

4-Chloro-7-[5-O-[(1,1-dimethylethyl)dimethylsilyl]-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-6-iodo-7H-pyrrolo[2,3-d]pyrimidine

4-Chloro-7-[5-O-[(1,1-dimethylethyl)dimethylsilyl]-2,3-O-(1-methylethylidene)-β-D-ribofuranosyl]-6-methyl-7H-pyrrolo[2,3-d]pyrimidine