5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-P(O)-(2-cyanoethyl)-P-thiothymidylyl-(3′→5′)-P(O)-(2-cyanoethyl)-2′-deoxy-N-(2-methyl-1-oxopropyl)-P-thioguanylyl-(3′→5′)-2′-deoxy-N-[3,4,5-tris(octadecyloxy)benzoyl]cytidine

5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-P(O)-(2-cyanoethyl)-2′-deoxy-N-(2-methyl-1-oxopropyl)-P-thioguanylyl-(3′→5′)-2′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-N-[3,4,5-tris(octadecyloxy)benzoyl]cytidine

5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-P(O)-(2-cyanoethyl)-P-thiothymidylyl-(3′→5′)-P(O)-(2-cyanoethyl)-2′-deoxy-N-(2-methyl-1-oxopropyl)-P-thioguanylyl-(3′→5′)-2′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-N-[3,4,5-tris(octadecyloxy)benzoyl]cytidine

5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-N-[3,4,5-tris(octadecyloxy)benzoyl]cytidine

1-[(6R,7S,8R)-7,8-Dihydroxy-2,5-dioxaspiro[3.4]oct-6-yl]-2,4(1H,3H)-pyrimidinedione

1-[(6R,7S,8R)-7,8-Dihydroxy-2,5-dioxaspiro[3.4]oct-6-yl]-5-methyl-2,4(1H,3H)-pyrimidinedione

4H,9H-1,3-Dioxino[4′′,5′′:4′,5′]furo[2′,3′:4,5]oxazolo[3,2-a]pyrimidin-9-one, 4a,5a,11a,11b-tetrahydro-2,2-dimethyl-4a-[[[(4-methylphenyl)sulfonyl]oxy]methyl]-, (4aS,5aR,11aS,11bR)-

4H,9H-1,3-Dioxino[4′′,5′′:4′,5′]furo[2′,3′:4,5]oxazolo[3,2-a]pyrimidin-9-one, 4a,5a,11a,11b-tetrahydro-2,2,8-trimethyl-4a-[[[(4-methylphenyl)sulfonyl]oxy]methyl]-, (4aS,5aR,11aS,11bR)-