Adenosine, 2′-deoxy-N-[[2-(4-nitrophenyl)ethoxy]carbonyl]-2′-[[[2-(4-nitrophenyl)ethoxy]carbonyl]amino]-3′,5′-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-

Adenosine, 2′-amino-2′-deoxy-3′-O-[3-hydroxy-1,1,3,3-tetrakis(1-methylethyl)disiloxanyl]-

Guanosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-N-[[2-(4-nitrophenyl)ethoxy]carbonyl]-2′-[[[2-(4-nitrophenyl)ethoxy]carbonyl]amino]-6-O-[2-(4-nitrophenyl)ethyl]-

Guanosine, 2′-deoxy-N-[[2-(4-nitrophenyl)ethoxy]carbonyl]-2′-[[[2-(4-nitrophenyl)ethoxy]carbonyl]amino]-6-O-[2-(4-nitrophenyl)ethyl]-

Guanosine, 2′-deoxy-N-[[2-(4-nitrophenyl)ethoxy]carbonyl]-2′-[[[2-(4-nitrophenyl)ethoxy]carbonyl]amino]-6-O-[2-(4-nitrophenyl)ethyl]-3′,5′-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-

Guanosine, 2′-deoxy-2′-[[[2-(4-nitrophenyl)ethoxy]carbonyl]amino]-6-O-[2-(4-nitrophenyl)ethyl]-3′,5′-O-[1,1,3,3-tetrakis(1-methylethyl)-1,3-disiloxanediyl]-

Guanosine, 2′-deoxy-2′-[[[2-(4-nitrophenyl)ethoxy]carbonyl]amino]-6-O-[2-(4-nitrophenyl)ethyl]-

Guanosine, 2′-deoxy-2′-[[[2-(4-nitrophenyl)ethoxy]carbonyl]amino]-6-O-[2-(4-nitrophenyl)ethyl]-N-(trimethylsilyl)-3′,5′-bis-O-(trimethylsilyl)-

Uridine, 2′-deoxy-2′-[[[2-(4-nitrophenyl)ethoxy]carbonyl]amino]-3′,5′-bis-O-(trimethylsilyl)-

Uridine, 2′-deoxy-2′-[[[2-(4-nitrophenyl)ethoxy]carbonyl]amino]-

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′-[[[2-(4-nitrophenyl)ethoxy]carbonyl]amino]-

Uridine, 2′-deoxy-5′-O-[(4-methoxyphenyl)diphenylmethyl]-2′-[[[2-(4-nitrophenyl)ethoxy]carbonyl]amino]-

Uridine, 2′-amino-2′-deoxy-5′-O-[(4-methoxyphenyl)diphenylmethyl]-

Uridine, 2′-azido-2′-deoxy-5′-O-[(4-methoxyphenyl)diphenylmethyl]-, 3′-[2-(4-nitrophenyl)ethyl carbonate]

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-N-[[2-(4-nitrophenyl)ethoxy]carbonyl]-2′-[[[2-(4-nitrophenyl)ethoxy]carbonyl]amino]-

Cytidine, 2′-deoxy-5′-O-[(4-methoxyphenyl)diphenylmethyl]-N-[[2-(4-nitrophenyl)ethoxy]carbonyl]-2′-[[[2-(4-nitrophenyl)ethoxy]carbonyl]amino]-

Cytidine, 2′-azido-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-N-[[2-(4-nitrophenyl)ethoxy]carbonyl]-, 3′-[2-(4-nitrophenyl)ethyl carbonate]

Cytidine, 2′-azido-2′-deoxy-5′-O-[(4-methoxyphenyl)diphenylmethyl]-N-[[2-(4-nitrophenyl)ethoxy]carbonyl]-, 3′-[2-(4-nitrophenyl)ethyl carbonate]

2′-Azido-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxycytidine

Cytidine, 2′-azido-2′-deoxy-5′-O-[(4-methoxyphenyl)diphenylmethyl]-