Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[3-oxo-2-[[(4-pentyn-1-yldithio)methoxy]methyl]-3-(2-propyn-1-yloxy)-2-[(2-propyn-1-yloxy)carbonyl]propyl N,N-bis(1-methylethyl)phosphoramidite]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[2-cyano-3-ethoxy-3-oxo-2-[[[(1-methylethyl)dithio]methoxy]methyl]propyl N,N-bis(1-methylethyl)phosphoramidite]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[3-[(4-ethynylphenyl)methoxy]-2-[[(4-ethynylphenyl)methoxy]carbonyl]-2-[[[(1-methylethyl)dithio]methoxy]methyl]-3-oxopropyl N,N-bis(1-methylethyl)phosphoramidite]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[2-[[[(1-methylethyl)dithio]methoxy]methyl]-3-oxo-3-(2-propyn-1-yloxy)-2-[(2-propyn-1-yloxy)carbonyl]propyl N,N-bis(1-methylethyl)phosphoramidite]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′-fluoro-, 3′-[2-[[(dodecyldithio)methoxy]methyl]-3-ethoxy-2-(ethoxycarbonyl)-3-oxopropyl N,N-bis(1-methylethyl)phosphoramidite]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[2-[[[[3-[bis(4-methoxyphenyl)phenylmethoxy]propyl]dithio]methoxy]methyl]-3-ethoxy-2-(ethoxycarbonyl)-3-oxopropyl N,N-bis(1-methylethyl)phosphoramidite]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-, 3′-[3-ethoxy-2-(ethoxycarbonyl)-3-oxo-2-[[(4-pentyn-1-yldithio)methoxy]methyl]propyl N,N-bis(1-methylethyl)phosphoramidite]

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′-fluoro-, 3′-[3-ethoxy-2-(ethoxycarbonyl)-2-[[[(1-methylethyl)dithio]methoxy]methyl]-3-oxopropyl N,N-bis(1-methylethyl)phosphoramidite]

Thymidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′-fluoro-, 3′-[2-[[[(6-azidohexyl)dithio]methoxy]methyl]-3-ethoxy-2-(ethoxycarbonyl)-3-oxopropyl N,N-bis(1-methylethyl)phosphoramidite]