N′-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-6-(methylthio)-1H-pyrazolo[3,4-d]pyrimidin-4-yl]-N,N-dimethylethanimidamide

N′-[1-(2-Deoxy-β-D-erythro-pentofuranosyl)-6-(methylthio)-1H-pyrazolo[3,4-d]pyrimidin-4-yl]-N,N-dimethylethanimidamide

N′-[1-(2-Deoxy-β-D-erythro-pentofuranosyl)-6-(methylthio)-1H-pyrazolo[3,4-d]pyrimidin-4-yl]-N,N-dimethylmethanimidamide

2-(2-Deoxy-β-D-erythro-pentofuranosyl)-6-(methylthio)-2H-pyrazolo[3,4-d]pyrimidin-4-amine

2-(2-Deoxy-β-D-erythro-pentofuranosyl)-4-(1-methylethoxy)-6-(methylthio)-2H-pyrazolo[3,4-d]pyrimidine

1-(2-Deoxy-β-D-erythro-pentofuranosyl)-4-(1-methylethoxy)-6-(methylthio)-1H-pyrazolo[3,4-d]pyrimidine

2-[2-Deoxy-3,5-bis-O-(4-methylbenzoyl)-β-D-erythro-pentofuranosyl]-4-(1-methylethoxy)-6-(methylthio)-2H-pyrazolo[3,4-d]pyrimidine

1-[2-Deoxy-3,5-bis-O-(4-methylbenzoyl)-β-D-erythro-pentofuranosyl]-4-(1-methylethoxy)-6-(methylthio)-1H-pyrazolo[3,4-d]pyrimidine

N′-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-β-D-erythro-pentofuranosyl]-3-chloro-1H-pyrazolo[3,4-d]pyrimidin-4-yl]-N,N-dimethylmethanimidamide

N′-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-3-chloro-1H-pyrazolo[3,4-d]pyrimidin-4-yl]-N,N-dimethylmethanimidamide

N′-[3-Chloro-1-(2-deoxy-β-D-erythro-pentofuranosyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yl]-N,N-dimethylmethanimidamide

3-Chloro-1-(2-deoxy-β-D-erythro-pentofuranosyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine

3-Chloro-1-(2-deoxy-β-D-erythro-pentofuranosyl)-4-methoxy-1H-pyrazolo[3,4-d]pyrimidine

3-Chloro-1-[2-deoxy-3,5-bis-O-(4-methylbenzoyl)-β-D-erythro-pentofuranosyl]-4-methoxy-1H-pyrazolo[3,4-d]pyrimidine

5′-O-[(1,1-Dimethylethyl)diphenylsilyl]-5-[[[(1,1-dimethylethyl)diphenylsilyl]oxy]methyl]-2′,3′-O-(1-methylethylidene)uridine

5′-O-[(1,1-Dimethylethyl)diphenylsilyl]-5-methyl-2′,3′-O-(1-methylethylidene)uridine

Uridine, 5′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-[[[(1,1-dimethylethyl)diphenylsilyl]oxy]methyl]-, 2′,3′-bis(S-methyl carbonodithioate)

5′-O-[(1,1-Dimethylethyl)diphenylsilyl]-5-[[[(1,1-dimethylethyl)diphenylsilyl]oxy]methyl]uridine

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-[(1,1-dimethylethyl)dimethylsilyl]-, 3′-[O-ethyl (R)-phosphorothioate]

Uridine, [P(R)]-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-[(1,1-dimethylethyl)dimethylsilyl]-P-thiouridylyl-(3′→5′)-, 2′,3′-dibenzoate