1-(2,3,5-Tri-O-benzoyl-β-D-ribofuranosyl)pyrimido[4,5-d]pyrimidine-2,4(1H,3H)-dione

Adenosine, uridylyl-(3′→5′)-guanylyl-(3′→5′)-guanylyl-(3′→5′)-guanylyl-(3′→5′)-cytidylyl-(3′→5′)-

Cytidine, P(S)-(2-cyanoethyl)-2′-deoxy-6-O-(2,5-dichlorophenyl)-N-(2-methyl-1-oxopropyl)-P-thioguanylyl-(3′→5′)-N-benzoyl-P(S)-(4-chlorophenyl)-2′-deoxy-P-thioadenylyl-(3′→5′)-N-benzoyl-2′-deoxy-, 3′-(4-oxopentanoate)

Cytidine, N-benzoyl-P(S)-(4-chlorophenyl)-2′-deoxy-P-thioadenylyl-(3′→5′)-N-benzoyl-2′-deoxy-, 3′-(4-oxopentanoate)

Adenosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(S)-(2-cyanoethyl)-2′-deoxy-6-O-(2,5-dichlorophenyl)-N-(2-methyl-1-oxopropyl)-P-thioguanylyl-(3′→5′)-N-benzoyl-2′-deoxy-, 3′-(4-oxopentanoate)

Guanosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(S)-(4-chlorophenyl)-P-thiothymidylyl-(3′→5′)-2′-deoxy-6-O-(2,5-dichlorophenyl)-N-(2-methyl-1-oxopropyl)-, 3′-(4-oxopentanoate)

Cytidine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(S)-(4-chlorophenyl)-2′-deoxy-P-thioadenylyl-(3′→5′)-N-benzoyl-2′-deoxy-, 3′-(4-oxopentanoate)

1-[(5R,6R,8R,9R)-4-Amino-9-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-6-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]-2,2-dioxido-1,7-dioxa-2-thia-3-azaspiro[4.4]non-3-en-8-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[(5R,6R,8R,9R)-4-Amino-9-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-6-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]-2-oxo-1,7-dioxa-3-azaspiro[4.4]non-3-en-8-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

Guanosine, 2′-deoxy-6-O-(2,5-dichlorophenyl)-N-(2-methyl-1-oxopropyl)-, 3′-(4-oxopentanoate)

Uridine, 5-[2-(7-amino-9H-fluoren-2-yl)ethynyl]-2′-deoxy-

Uridine, 2′-deoxy-5-[2-[7-(dimethylamino)-9H-fluoren-2-yl]ethynyl]-

Uridine, 2′-deoxy-5-[2-[7-[(2,2,2-trifluoroacetyl)amino]-9H-fluoren-2-yl]ethynyl]-

(1S)-1-Methyl-2-(1-methylethoxy)-2-oxoethyl phenyl [P(S)]-2′-deoxy-2′,2′,5-trifluoro-N-(1-oxo-2-propylpentyl)-5′-cytidylate

(1S)-1-Methyl-2-(1-methylethoxy)-2-oxoethyl phenyl [P(S)]-N-benzoyl-2′-deoxy-2′,2′,5-trifluoro-5′-cytidylate

(1S)-1-Methyl-2-(1-methylethoxy)-2-oxoethyl phenyl [P(R)]-2′-deoxy-2′,2′,5-trifluoro-N-(1-oxo-2-propylpentyl)-5′-cytidylate

(1S)-1-Methyl-2-(1-methylethoxy)-2-oxoethyl phenyl [P(R)]-N-benzoyl-2′-deoxy-2′,2′,5-trifluoro-5′-cytidylate