Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-2′-O-methyl-N-(2-methyl-1-oxopropyl)guanylylmethyleneimino-(3′→5′)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2′-O-methyl-

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-2′-O-methyl-N-(2-methyl-1-oxopropyl)guanylylmethyleneimino-(3′→5′)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2′-O-methyl-

Uridine, N-(2-amino-2-iminoethyl)-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-2′-O-methyladenylylmethyleneimino-(3′→5′)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2′-O-methyl-

Cytidine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-5-methyl-2′-O-methyluridylylmethyleneimino-(3′→5′)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2′-O-methyl-

Uridine, 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-de(phosphinicooxy)-5-methyl-2′-O-methyluridylylmethyleneimino-(3′→5′)-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2′-O-methyl-

Guanosine, N-[(dimethylamino)methylene]-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-5′-O-(methyleneamino)-

Adenosine, 3′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-O-methyl-5′-O-(methyleneamino)-

Cytidine, 3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2′-O-methyl-5′-O-(methyleneamino)-

Cytidine, N-benzoyl-3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2′-O-methyl-5′-O-(methyleneamino)-

Uridine, 3′-O-[(1,1-dimethylethyl)diphenylsilyl]-5-methyl-2′-O-methyl-5′-O-(methyleneamino)-

N-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-deoxy-3-iodo-2-O-methyl-β-D-xylofuranosyl]-9H-purin-6-yl]benzamide

N-[9-(3-Deoxy-3-iodo-2-O-methyl-β-D-xylofuranosyl)-6,9-dihydro-6-oxo-1H-purin-2-yl]-2-methylpropanamide

Guanidine, [9-(3-deoxy-3-iodo-2-O-methyl-β-D-xylofuranosyl)-9H-purin-6-yl]-

1-(3-Deoxy-3-iodo-2-O-methyl-β-D-xylofuranosyl)-5-methyl-2,4(1H,3H)-pyrimidinedione

N′-[9-[3-Deoxy-5-O-[(1,1-dimethylethyl)diphenylsilyl]-3-iodo-2-O-methyl-β-D-xylofuranosyl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-N,N-dimethylmethanimidamide

N′-[9-[3-Deoxy-5-O-[(1,1-dimethylethyl)diphenylsilyl]-3-iodo-2-O-methyl-β-D-xylofuranosyl]-9H-purin-6-yl]-N,N-dimethylmethanimidamide

1-[3-Deoxy-5-O-[(1,1-dimethylethyl)diphenylsilyl]-3-iodo-2-O-methyl-β-D-xylofuranosyl]-5-methyl-2,4(1H,3H)-pyrimidinedione

N′-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-deoxy-3-iodo-2-O-methyl-β-D-xylofuranosyl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-N,N-dimethylmethanimidamide

N-[9-[5-O-[Bis(4-methoxyphenyl)phenylmethyl]-3-deoxy-3-iodo-2-O-methyl-β-D-xylofuranosyl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-2-methylpropanamide

Guanidine, [9-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-3-deoxy-3-iodo-2-O-methyl-β-D-xylofuranosyl]-9H-purin-6-yl]-