1-[2-(4-Nitrophenyl)ethyl] N-[9-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-3-O-(3-carboxy-1-oxopropyl)-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-6-[2-(4-nitrophenyl)ethoxy]-9H-purin-2-yl]carbamate

1-[2-(4-Nitrophenyl)ethyl] N-[9-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-3-O-(3-carboxy-1-oxopropyl)-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-9H-purin-6-yl]carbamate

1-[2-(4-Nitrophenyl)ethyl] N-[1-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-3-O-(3-carboxy-1-oxopropyl)-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-1,2-dihydro-2-oxo-4-pyrimidinyl]carbamate

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-(3-carboxy-1-oxopropyl)-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-(3-carboxy-1-oxopropyl)-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-2,4(1H,3H)-pyrimidinedione

1-[2-(4-Nitrophenyl)ethyl] N-[9-[3-O-(3-carboxy-1-oxopropyl)-5-O-[(4-methoxyphenyl)diphenylmethyl]-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-6-[2-(4-nitrophenyl)ethoxy]-9H-purin-2-yl]carbamate

1-[2-(4-Nitrophenyl)ethyl] N-[9-[3-O-(3-carboxy-1-oxopropyl)-5-O-[(4-methoxyphenyl)diphenylmethyl]-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-9H-purin-6-yl]carbamate

1-[2-(4-Nitrophenyl)ethyl] N-[1-[3-O-(3-carboxy-1-oxopropyl)-5-O-[(4-methoxyphenyl)diphenylmethyl]-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-1,2-dihydro-2-oxo-4-pyrimidinyl]carbamate

1-[3-O-(3-Carboxy-1-oxopropyl)-5-O-[(4-methoxyphenyl)diphenylmethyl]-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[3-O-(3-Carboxy-1-oxopropyl)-5-O-[(4-methoxyphenyl)diphenylmethyl]-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-2,4(1H,3H)-pyrimidinedione

9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-2-[[2-(4-nitrophenyl)ethyl]amino]-9H-purin-6-yl 2-(4-nitrophenyl)ethyl carbonate

2-(4-Nitrophenyl)ethyl N-[9-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-9H-purin-6-yl]carbamate

2-(4-Nitrophenyl)ethyl N-[1-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-1,2-dihydro-2-oxo-4-pyrimidinyl]carbamate

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-2,4(1H,3H)-pyrimidinedione

2-(4-Nitrophenyl)ethyl N-[9-[3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-5-O-[(4-methoxyphenyl)diphenylmethyl]-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-6-[2-(4-nitrophenyl)ethoxy]-9H-purin-2-yl]carbamate

2-(4-Nitrophenyl)ethyl N-[9-[3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-5-O-[(4-methoxyphenyl)diphenylmethyl]-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-9H-purin-6-yl]carbamate

2-(4-Nitrophenyl)ethyl N-[1-[3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-5-O-[(4-methoxyphenyl)diphenylmethyl]-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-1,2-dihydro-2-oxo-4-pyrimidinyl]carbamate

1-[3-O-[[Bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-5-O-[(4-methoxyphenyl)diphenylmethyl]-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

1-[3-O-[[Bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-5-O-[(4-methoxyphenyl)diphenylmethyl]-2-O-[[2-(4-nitrophenyl)ethoxy]carbonyl]-α-D-arabinofuranosyl]-2,4(1H,3H)-pyrimidinedione