Methyl 1-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-3-O-[(S)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-2-fluoro-β-D-ribofuranosyl]-1,2-dihydro-4-[(4-methoxybenzoyl)amino]-2-oxo-5-pyrimidinecarboxylate

Methyl 1-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-3-O-[(R)-[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-2-fluoro-β-D-ribofuranosyl]-1,2-dihydro-4-[(4-methoxybenzoyl)amino]-2-oxo-5-pyrimidinecarboxylate

Methyl 1-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-2-fluoro-β-D-ribofuranosyl]-1,2-dihydro-4-[(4-methoxybenzoyl)amino]-2-oxo-5-pyrimidinecarboxylate

Methyl 1-(2-deoxy-2-fluoro-β-D-ribofuranosyl)-1,2-dihydro-4-[(4-methoxybenzoyl)amino]-2-oxo-5-pyrimidinecarboxylate

Methyl 1-[2-deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-β-D-ribofuranosyl]-1,2-dihydro-4-[(4-methoxybenzoyl)amino]-2-oxo-5-pyrimidinecarboxylate

Methyl 4-amino-1-[2-deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-β-D-ribofuranosyl]-1,2-dihydro-2-oxo-5-pyrimidinecarboxylate

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-5-(1,3-dioxan-2-yl)-2′-fluoro-N-(4-methoxybenzoyl)-, 3′-[2-cyanoethyl [P(S)]-N,N-bis(1-methylethyl)phosphoramidite]

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-5-(1,3-dioxan-2-yl)-2′-fluoro-N-(4-methoxybenzoyl)-, 3′-[2-cyanoethyl [P(R)]-N,N-bis(1-methylethyl)phosphoramidite]

5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-5-(1,3-dioxan-2-yl)-2′-fluoro-N-(4-methoxybenzoyl)cytidine

2′-Deoxy-5-(1,3-dioxan-2-yl)-2′-fluoro-N-(4-methoxybenzoyl)cytidine