N-[7-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-β-D-erythro-pentofuranosyl]-7H-purin-2-yl]acetamide

N-[7-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-7H-purin-2-yl]acetamide

N-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-α-D-erythro-pentofuranosyl]-9H-purin-2-yl]acetamide

N-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-α-D-erythro-pentofuranosyl]-9H-purin-2-yl]acetamide

N-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-β-D-erythro-pentofuranosyl]-9H-purin-2-yl]acetamide

N-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-9H-purin-2-yl]acetamide

N-[7-(2-Deoxy-D-erythro-pentofuranosyl)-7H-purin-2-yl]acetamide

N-[7-(3,5-Di-O-acetyl-2-deoxy-D-erythro-pentofuranosyl)-7H-purin-2-yl]acetamide

N-[6-Chloro-7-(3,5-di-O-acetyl-2-deoxy-D-erythro-pentofuranosyl)-7H-purin-2-yl]acetamide

N-[9-(2-Deoxy-D-erythro-pentofuranosyl)-9H-purin-2-yl]acetamide

N-[9-(3,5-Di-O-acetyl-2-deoxy-D-erythro-pentofuranosyl)-9H-purin-2-yl]acetamide

N-[6-Chloro-9-(3,5-di-O-acetyl-2-deoxy-D-erythro-pentofuranosyl)-9H-purin-2-yl]acetamide

N′-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-β-D-erythro-pentofuranosyl]-1,4-dihydro-4-oxo-2-pyrimidinyl]-N,N-dimethylmethanimidamide

N′-[1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-1,4-dihydro-4-oxo-2-pyrimidinyl]-N,N-dimethylmethanimidamide

N,N-Dibutyl-N′-[1-(2-deoxy-β-D-erythro-pentofuranosyl)-1,4-dihydro-4-oxo-2-pyrimidinyl]methanimidamide

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(O)-[1-(cyanomethyl)-2,2-diethyl-4-pentenyl]-P-deoxothymidylyl-(3′→5′)-P(O)-[1-(cyanomethyl)-2,2-dimethylpropyl]-P-thiothymidylyl-(3′→5′)-

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(O)-[1-(cyanomethyl)-2,2-diethyl-4-pentenyl]-P-thiothymidylyl-(3′→5′)-P(O)-[1-(cyanomethyl)-2,2-dimethylpropyl]-P-thiothymidylyl-(3′→5′)-

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(O)-[1-(cyanomethyl)-2,2-dimethylpropyl]-P-thiothymidylyl-(3′→5′)-P(O)-[1-(cyanomethyl)-2,2-diethyl-4-pentenyl]-P-deoxothymidylyl-(3′→5′)-

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(O)-[1-(cyanomethyl)-2,2-dimethylpropyl]-P-thiothymidylyl-(3′→5′)-, 3′-[1-(cyanomethyl)-2,2-diethyl-4-pentenyl 1H-imidazol-1-ylphosphonite]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(O)-[1-(cyanomethyl)-2,2-dimethylpropyl]-P-thiothymidylyl-(3′→5′)-P(O)-[1-(cyanomethyl)-2,2-diethyl-4-pentenyl]-P-thiothymidylyl-(3′→5′)-