Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-5-[2-[4-[2-[2,6-bis[(2-phenoxyacetyl)amino]-9-(3,6,9,12-tetraoxatridec-1-yl)-9H-purin-8-yl]ethynyl]phenyl]ethynyl]-2′-deoxy-, 3′-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite]

Cytidine, N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-5-[2-[4-[2-[2-[[(dimethylamino)methylene]amino]-6,9-dihydro-6-oxo-9-(3,6,9,12-tetraoxatridec-1-yl)-1H-purin-8-yl]ethynyl]phenyl]ethynyl]-, 3′-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite]

N-Benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-5-[2-[4-[2-[2-[[(dimethylamino)methylene]amino]-6,9-dihydro-6-oxo-9-(3,6,9,12-tetraoxatridec-1-yl)-1H-purin-8-yl]ethynyl]phenyl]ethynyl]cytidine

5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-5-[2-(4-iodophenyl)ethynyl]uridine

N-Acetyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-5-[2-(4-iodophenyl)ethynyl]cytidine

N-Acetyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-5-[2-(4-iodophenyl)ethynyl]cytidine