N-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-7-bromo-1H-imidazo[4,5-c]pyridin-4-yl]-2-phenoxyacetamide

N-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-β-D-ribofuranosyl]-7-bromo-1H-imidazo[4,5-c]pyridin-4-yl]-2-phenoxyacetamide

N-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2,3-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-7-bromo-1H-imidazo[4,5-c]pyridin-4-yl]-2-phenoxyacetamide

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2,3-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-7-bromo-1H-imidazo[4,5-c]pyridin-4-amine

N-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-1H-imidazo[4,5-c]pyridin-4-yl]-2-phenoxyacetamide

N-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-1H-imidazo[4,5-c]pyridin-4-yl]-2-phenoxyacetamide

N-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-β-D-ribofuranosyl]-1H-imidazo[4,5-c]pyridin-4-yl]-2-phenoxyacetamide

N-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2,3-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-1H-imidazo[4,5-c]pyridin-4-yl]-2-phenoxyacetamide

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2,3-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-1H-imidazo[4,5-c]pyridin-4-amine

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2,3-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-5-ethynyl-1H-imidazole-4-carbonitrile

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-β-D-ribofuranosyl]-5-ethynyl-1H-imidazole-4-carbonitrile

N′-[7-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-5-bromo-7H-pyrrolo[2,3-d]pyrimidin-4-yl]-N,N-dimethylmethanimidamide

N′-[7-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-5-bromo-7H-pyrrolo[2,3-d]pyrimidin-4-yl]-N,N-dimethylmethanimidamide

N′-[7-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-β-D-ribofuranosyl]-5-bromo-7H-pyrrolo[2,3-d]pyrimidin-4-yl]-N,N-dimethylmethanimidamide

7-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-β-D-ribofuranosyl]-5-bromo-7H-pyrrolo[2,3-d]pyrimidin-4-amine

7-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-β-D-ribofuranosyl]-5-bromo-4-chloro-7H-pyrrolo[2,3-d]pyrimidine

N′-[7-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]-N,N-dimethylmethanimidamide

N′-[7-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]-N,N-dimethylmethanimidamide

N′-[7-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-β-D-ribofuranosyl]-7H-pyrrolo[2,3-d]pyrimidin-4-yl]-N,N-dimethylmethanimidamide

7-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-β-D-ribofuranosyl]-4-chloro-7H-pyrrolo[2,3-d]pyrimidine