N-(2-Mercapto-1-oxopropyl)glycine 2-[3-[2-C-methyl-5-O-[(S)-[[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethyl]amino]phenoxyphosphinyl]-β-D-ribofuranosyl]-3,6-dihydro-2,6-dioxo-1(2H)-pyrimidinyl]-2-oxoethyl ester

N-Acetyl-L-cysteinyl-[P(S),2′R]-2′-deoxy-2′-fluoro-3′-O-(hydroxymethyl)-2′-methyl-P-phenyl-5′-uridylyl-L-alanine 1-methylethyl ester

N-Acetyl-D-cysteinyl-[P(S),2′R]-2′-deoxy-2′-fluoro-2′-methyl-P-phenyl-5′-uridylyl-L-alanine 1-methylethyl ester

N-Acetylcysteinyl-[P(S),2′R]-2′-deoxy-2′-fluoro-2′-methyl-P-phenyl-5′-uridylyl-L-alanine 1-methylethyl ester

N-(2-Mercapto-1-oxobutyl)-L-alanyl-[P(S),2′R]-2′-deoxy-2′-fluoro-2′-methyl-P-phenyl-5′-uridylyl-L-alanine 1-methylethyl ester

N-[(2S)-2-Mercapto-1-oxopropyl]glycyl-[P(S),2′R]-2′-deoxy-2′-fluoro-2′-methyl-P-phenyl-5′-uridylyl-L-alanine 1-methylethyl ester

Cytidine, N-[[(aminocarbonyl)amino]carbonyl]-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-, 3′-[2-cyanoethyl bis(1-methylethyl)phosphoramidite]

N-Acetyl-L-cysteine [3-[(2R)-2-chloro-2-deoxy-2-methyl-5-O-[(S)-[[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethyl]amino]phenoxyphosphinyl]-β-D-erythro-pentofuranosyl]-3,6-dihydro-2,6-dioxo-1(2H)-pyrimidinyl]methyl ester

N-(1-Oxopropyl)-L-cysteine [3-[(2R)-2-deoxy-2-fluoro-2-methyl-5-O-[(S)-[[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethyl]amino]phenoxyphosphinyl]-β-D-erythro-pentofuranosyl]-3,6-dihydro-2,6-dioxo-1(2H)-pyrimidinyl]methyl ester

N-Acetyl-L-cysteine 1-[3-[(2R)-2-deoxy-2-fluoro-2-methyl-5-O-[(S)-[[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethyl]amino]phenoxyphosphinyl]-β-D-erythro-pentofuranosyl]-3,6-dihydro-2,6-dioxo-1(2H)-pyrimidinyl]ethyl ester

N-Acetyl-D-cysteine [3-[(2R)-2-deoxy-2-fluoro-2-methyl-5-O-[(S)-[[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethyl]amino]phenoxyphosphinyl]-β-D-erythro-pentofuranosyl]-3,6-dihydro-2,6-dioxo-1(2H)-pyrimidinyl]methyl ester

N-Acetyl-L-cysteine [3-[(2R)-2-deoxy-2-fluoro-2-methyl-5-O-[(S)-[[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethyl]amino]phenoxyphosphinyl]-β-D-erythro-pentofuranosyl]-3,6-dihydro-2,6-dioxo-1(2H)-pyrimidinyl]methyl ester

N-Acetyl-L-cysteine [3-[(2R)-2-deoxy-2-fluoro-2-methyl-5-O-[(S)-[[(1S)-1-methyl-2-(1-methylethoxy)-2-oxoethyl]amino]phenoxyphosphinyl]-β-D-erythro-pentofuranosyl]-3,6-dihydro-2,6-dioxo-1(2H)-pyrimidinyl]methyl ester

N-[[P(S),2′R]-2′-Deoxy-2′-fluoro-3-[[(2S)-2-[(2-mercapto-1-oxopropyl)amino]-1-oxopropoxy]methyl]-2′-methyl-P-phenyl-5′-uridylyl]-L-alanine 1-methylethyl ester

N-[[P(S),2′R]-2′-Chloro-2′-deoxy-3-[[[2-[(2-mercapto-1-oxopropyl)amino]acetyl]oxy]methyl]-2′-methyl-P-phenyl-5′-uridylyl]-L-alanine 1-methylethyl ester

N-[[P(S),2′R]-2′-Deoxy-2′-fluoro-3-[1-[[2-[(2-mercapto-1-oxopropyl)amino]acetyl]oxy]propyl]-2′-methyl-P-phenyl-5′-uridylyl]-L-alanine 1-methylethyl ester

N-[[P(S),2′R]-2′-Deoxy-2′-fluoro-3-[[[2-[[(2S)-2-mercapto-1-oxopropyl]amino]acetyl]oxy]methyl]-2′-methyl-P-phenyl-5′-uridylyl]-L-alanine 1-methylethyl ester