3′-O-[(Ethyldithio)methyl]thymidine

5′-O-[(1,1-Dimethylethyl)dimethylsilyl]-3′-O-[(ethyldithio)methyl]thymidine

5′-O-[(1,1-Dimethylethyl)dimethylsilyl]-3′-O-[[[(4-methylphenyl)sulfonyl]thio]methyl]thymidine

5-(3-Amino-1-propyn-1-yl)-2′-deoxy-3′-O-[[(1,1-dimethylethyl)dithio]methyl]cytidine 5′-(tetrahydrogen triphosphate)

2′-Deoxy-3′-O-[[(1,1-dimethylethyl)dithio]methyl]-5-[3-[(2,2,2-trifluoroacetyl)amino]-1-propyn-1-yl]cytidine

2′-Deoxy-N-[(dimethylamino)methylene]-3′-O-[[(1,1-dimethylethyl)dithio]methyl]-5-[3-[(2,2,2-trifluoroacetyl)amino]-1-propyn-1-yl]-5′-O-(triphenylmethyl)cytidine

2′-Deoxy-N-[(dimethylamino)methylene]-3′-O-[[[(4-methylphenyl)sulfonyl]thio]methyl]-5-[3-[(2,2,2-trifluoroacetyl)amino]-1-propyn-1-yl]-5′-O-(triphenylmethyl)cytidine

2′-Deoxy-N-[(dimethylamino)methylene]-3′-O-[(methylthio)methyl]-5-[3-[(2,2,2-trifluoroacetyl)amino]-1-propyn-1-yl]-5′-O-(triphenylmethyl)cytidine

2′-Deoxy-N-[(dimethylamino)methylene]-5-[3-[(2,2,2-trifluoroacetyl)amino]-1-propyn-1-yl]-5′-O-(triphenylmethyl)cytidine

2′-Deoxy-N-[(dimethylamino)methylene]-5-iodo-5′-O-(triphenylmethyl)cytidine

5′-Cytidylic acid, N-[(phenylmethoxy)carbonyl]-, (1R)-1-[bis(phenylmethoxy)phosphinyl]-2-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)ethyl phenylmethyl ester, 2′,3′-bis(phenylmethyl carbonate), [P(S)]-

5′-Cytidylic acid, N-[(phenylmethoxy)carbonyl]-, (1S)-1-[bis(phenylmethoxy)phosphinyl]-2-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)ethyl phenylmethyl ester, 2′,3′-bis(phenylmethyl carbonate), [P(R)]-

5′-Cytidylic acid, N-[(phenylmethoxy)carbonyl]-, (1S)-1-[bis(phenylmethoxy)phosphinyl]-2-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)ethyl phenylmethyl ester, 2′,3′-bis(phenylmethyl carbonate), [P(S)]-

5′-Cytidylic acid, N-[(phenylmethoxy)carbonyl]-, (1R)-1-[bis(phenylmethoxy)phosphinyl]-2-(2,5-dioxo-1-pyrrolidinyl)-2-oxoethyl phenylmethyl ester, 2′,3′-bis(phenylmethyl carbonate), [P(S)]-

5′-Cytidylic acid, N-[(phenylmethoxy)carbonyl]-, (1S)-1-[bis(phenylmethoxy)phosphinyl]-2-(2,5-dioxo-1-pyrrolidinyl)-2-oxoethyl phenylmethyl ester, 2′,3′-bis(phenylmethyl carbonate), [P(R)]-

5′-Cytidylic acid, N-[(phenylmethoxy)carbonyl]-, (1S)-1-[bis(phenylmethoxy)phosphinyl]-2-(2,5-dioxo-1-pyrrolidinyl)-2-oxoethyl phenylmethyl ester, 2′,3′-bis(phenylmethyl carbonate), [P(S)]-

5′-Cytidylic acid, N-[(phenylmethoxy)carbonyl]-, (1R)-1-[bis(phenylmethoxy)phosphinyl]-2-oxo-2-(1-piperidinyl)ethyl phenylmethyl ester, 2′,3′-bis(phenylmethyl carbonate), [P(S)]-

5′-Cytidylic acid, N-[(phenylmethoxy)carbonyl]-, (1S)-1-[bis(phenylmethoxy)phosphinyl]-2-oxo-2-(1-piperidinyl)ethyl phenylmethyl ester, 2′,3′-bis(phenylmethyl carbonate), [P(R)]-

5′-Cytidylic acid, N-[(phenylmethoxy)carbonyl]-, (1S)-1-[bis(phenylmethoxy)phosphinyl]-2-oxo-2-(1-piperidinyl)ethyl phenylmethyl ester, 2′,3′-bis(phenylmethyl carbonate), [P(S)]-

5′-Cytidylic acid, N-[(phenylmethoxy)carbonyl]-, (1R)-1-[bis(phenylmethoxy)phosphinyl]-2-oxo-2-(1-pyrrolidinyl)ethyl phenylmethyl ester, 2′,3′-bis(phenylmethyl carbonate), [P(S)]-