1-[5-O-(Aminosulfonyl)-2-deoxy-3-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-3-[(cyclopropylmethyl)thio]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

3-[(Cyclopropylmethyl)thio]-1-[2-deoxy-3-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

3-[(Cyclopropylmethyl)thio]-1-[2-deoxy-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-amine

4-Amino-1-[2-deoxy-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-1,2-dihydro-3H-pyrazolo[3,4-d]pyrimidine-3-thione

1-[2-Deoxy-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-3-(methylsulfinyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine

1-[2-Deoxy-3,5-bis-O-[tris(1-methylethyl)silyl]-β-D-erythro-pentofuranosyl]-3-(methylthio)-1H-pyrazolo[3,4-d]pyrimidin-4-amine

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-(2-cyanoethyl)thymidylyl-(3′→5′)-2′-deoxy-5-[2-oxo-2-(propylamino)ethyl]-, 3′-acetate

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-5-[2-oxo-2-(propylamino)ethyl]-, 3′-acetate

5′-O-Phosphonothymidylyl-(3′→5′)-2′-deoxy-5-[2-oxo-2-(propylamino)ethyl]uridine

Uridine, P-(2-cyanoethyl)thymidylyl-(3′→5′)-2′-deoxy-5-[2-[(3-methoxy-3-oxopropyl)amino]-2-oxoethyl]-, 3′-acetate

Uridine, P-(2-cyanoethyl)thymidylyl-(3′→5′)-5-[2-[[2-(acetyloxy)ethyl]amino]-2-oxoethyl]-2′-deoxy-, 3′-acetate

Uridine, P-(2-cyanoethyl)thymidylyl-(3′→5′)-2′-deoxy-5-[2-oxo-2-(propylamino)ethyl]-, 3′-acetate

N-[2-[1-(3-O-Acetyl-2-deoxy-β-D-erythro-pentofuranosyl)-1,2,3,4-tetrahydro-2,4-dioxo-5-pyrimidinyl]acetyl]-β-alanine methyl ester

Uridine, 5-[2-[[2-(acetyloxy)ethyl]amino]-2-oxoethyl]-2′-deoxy-, 3′-acetate

Uridine, 2′-deoxy-5-[2-oxo-2-(propylamino)ethyl]-, 3′-acetate

5′-O-[[2-[[Bis(4-methoxyphenyl)phenylmethoxy]methyl]-3-ethoxy-2-(ethoxycarbonyl)-3-oxopropoxy](2-cyanoethoxy)phosphinyl]-5-[2-[[2-[bis[2-[(2,2,2-trifluoroacetyl)amino]ethyl]amino]ethyl]amino]-2-oxoethyl]-P-(2-cyanoethyl)-2′-deoxyuridylyl-(3′→5′)-2′-deoxy-5-[2-[[2-[bis[2-[(2,2,2-trifluoroacetyl)amino..

5′-O-[[2-[[Bis(4-methoxyphenyl)phenylmethoxy]methyl]-3-ethoxy-2-(ethoxycarbonyl)-3-oxopropoxy](2-cyanoethoxy)phosphinyl]-P-(2-cyanoethyl)thymidylyl-(3′→5′)-2′-deoxy-5-[2-[[2-[bis[2-[(2,2,2-trifluoroacetyl)amino]ethyl]amino]ethyl]amino]-2-oxoethyl]uridine

P-(2-Cyanoethyl)-2′-deoxy-5-[2-[[2-[bis[2-[(2,2,2-trifluoroacetyl)amino]ethyl]amino]ethyl]amino]-2-oxoethyl]uridylyl-(3′→5′)-2′-deoxy-5-[2-[[2-[bis[2-[(2,2,2-trifluoroacetyl)amino]ethyl]amino]ethyl]amino]-2-oxoethyl]uridine

P-(2-Cyanoethyl)thymidylyl-(3′→5′)-2′-deoxy-5-[2-[[2-[bis[2-[(2,2,2-trifluoroacetyl)amino]ethyl]amino]ethyl]amino]-2-oxoethyl]uridine

7-[5-O-[[Bis(1-methylethoxy)phosphinyl]methyl]-β-D-ribofuranosyl]-5-fluoro-4-(2-thienyl)-7H-pyrrolo[2,3-d]pyrimidine