Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(S)-(2-pyridinylmethyl)-P-thiothymidylyl-(3′→5′)-

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P(S)-[(2-nitrophenyl)methyl]-P-thiothymidylyl-(3′→5′)-

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[S-[[1-(methoxymethyl)-1H-imidazol-2-yl]methyl] hydrogen phosphorodithioate]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[S-[(1-oxido-2-pyridinyl)methyl] hydrogen phosphorodithioate]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[S-[(4-chloro-2-pyridinyl)methyl] hydrogen phosphorodithioate]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[S-(2-pyridinylmethyl) hydrogen phosphorodithioate]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[S-[(2-nitrophenyl)methyl] hydrogen phosphorodithioate]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[O-(2-cyanoethyl) S-[[1-(methoxymethyl)-1H-imidazol-2-yl]methyl] phosphorodithioate]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[O-(2-cyanoethyl) S-[(1-oxido-2-pyridinyl)methyl] phosphorodithioate]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[S-[(4-chloro-2-pyridinyl)methyl] O-(2-cyanoethyl) phosphorodithioate]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[O-(2-cyanoethyl) S-(2-pyridinylmethyl) phosphorodithioate]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[O-(2-cyanoethyl) S-[(2-nitrophenyl)methyl] phosphorodithioate]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[O-(2-cyanoethyl) phosphonothioate]

N-Acetyl-2′-O-methyl-3′,5′-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]cytidine

Cytidine, N-acetyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-, 3′-(hydrogen butanedioate)

Cytidine, N-acetyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-, 3′-(hydrogen phosphonate)

Cytidine, 2′-deoxy-N-(1-oxopropyl)-

Guanosine 5′-(tetrahydrogen triphosphate), 2′-deoxy-7,8-dihydro-8-oxo-, ion(2-)

Phenylmethyl N-[2-[[3-[2-deoxy-5-O-[(4-methylphenyl)sulfonyl]-β-D-erythro-pentofuranosyl]-2,3-dihydro-2-oxo-1H-pyrimido[5,4-b][1,4]benzoxazin-9-yl]oxy]ethyl]carbamate

2-(1-Pyrenyl)ethyl N-[2-[[3-[2,5-dideoxy-5-[4-[[4,7,10-tris[(1,1-dimethylethoxy)carbonyl]-1,4,7,10-tetraazacyclododec-1-yl]methyl]-1H-1,2,3-triazol-1-yl]-β-D-erythro-pentofuranosyl]-2,3-dihydro-2-oxo-1H-pyrimido[5,4-b][1,4]benzoxazin-9-yl]oxy]ethyl]carbamate