Guanosine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxy-2′-fluoro-N-(2-methyl-1-oxopropyl)-3′-O-[(1S,3S,3aS)-tetrahydro-3-[(phenylsulfonyl)methyl]-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaphosphol-1-yl]-

Thymidine, [P(S)]-N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]adenylyl-(3′→5′)-3′-O-[bis(4-methoxyphenyl)phenylmethyl]-

Guanosine, [P(S)]-N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methyladenylyl-(3′→5′)-2′-O-methyl-N-(2-methyl-1-oxopropyl)-3′-O-[(1R,3R,3aR)-tetrahydro-3-[(methyldiphenylsilyl)methyl]-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaphosphol-1-yl]-

Guanosine, [P(S)]-N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methyladenylyl-(3′→5′)-2′-O-methyl-N-(2-methyl-1-oxopropyl)-3′-O-[(1S,3S,3aS)-tetrahydro-3-[(methyldiphenylsilyl)methyl]-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaphosphol-1-yl]-

Guanosine, [P(S)]-N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methyladenylyl-(3′→5′)-2′-O-methyl-N-(2-methyl-1-oxopropyl)-

Guanosine, [P(R)]-N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methyladenylyl-(3′→5′)-2′-O-methyl-N-(2-methyl-1-oxopropyl)-3′-O-[(1S,3S,3aS)-tetrahydro-3-[(methyldiphenylsilyl)methyl]-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaphosphol-1-yl]-

Guanosine, [P(R)]-N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methyladenylyl-(3′→5′)-2′-O-methyl-N-(2-methyl-1-oxopropyl)-

Guanosine, [P(S)]-N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methyladenylyl-(3′→5′)-2′-deoxy-2′-fluoro-N-(2-methyl-1-oxopropyl)-3′-O-[(1S,3S,3aS)-tetrahydro-3-[(methyldiphenylsilyl)methyl]-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaphosphol-1-yl..

Guanosine, [P(S)]-N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methyladenylyl-(3′→5′)-2′-deoxy-2′-fluoro-N-(2-methyl-1-oxopropyl)-

Guanosine, [P(R)]-N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methyladenylyl-(3′→5′)-2′-deoxy-2′-fluoro-N-(2-methyl-1-oxopropyl)-3′-O-[(1S,3S,3aS)-tetrahydro-3-[(methyldiphenylsilyl)methyl]-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaphosphol-1-yl..

Guanosine, [P(R)]-N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methyladenylyl-(3′→5′)-2′-deoxy-2′-fluoro-N-(2-methyl-1-oxopropyl)-

Uridine, [P(S)]-N-acetyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methylcytidylyl-(3′→5′)-2′-deoxy-2′-fluoro-3′-O-[(1S,3S,3aS)-tetrahydro-3-[(methyldiphenylsilyl)methyl]-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaphosphol-1-yl]-

Uridine, [P(S)]-N-acetyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methylcytidylyl-(3′→5′)-2′-deoxy-2′-fluoro-

Uridine, [P(R)]-N-acetyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methylcytidylyl-(3′→5′)-2′-deoxy-2′-fluoro-3′-O-[(1S,3S,3aS)-tetrahydro-3-[(methyldiphenylsilyl)methyl]-1H,3H-pyrrolo[1,2-c][1,3,2]oxazaphosphol-1-yl]-

Uridine, [P(R)]-N-acetyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methylcytidylyl-(3′→5′)-2′-deoxy-2′-fluoro-

[P(S)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methyluridylyl-(3′→5′)-2′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-2′-fluorouridine

[P(R)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methyluridylyl-(3′→5′)-2′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-2′-fluorouridine

5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-P-deoxy-P-[(1,3-dimethyl-2-imidazolidinylidene)amino]-2′-O-methyluridylyl-(3′→5′)-2′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-2′-fluorouridine