[N(E)]-5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-3′-deoxy-N-[(dimethylamino)methylene]-2′-O-[(1,1-dimethylethyl)dimethylsilyl]-3′-[(phenylmethyl)amino]guanosine

5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-3′-deoxy-2′-O-[(1,1-dimethylethyl)dimethylsilyl]-3′-[(phenylmethyl)amino]guanosine

5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-3′-deoxy-3′-[(phenylmethyl)amino]guanosine

(1E)-N′-[9-[(3aR,4S,6R,6aR)-4-[[Bis(4-methoxyphenyl)phenylmethoxy]methyl]hexahydro-2-oxo-3-(phenylmethyl)furo[3,4-d]oxazol-6-yl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-N,N-dimethylmethanimidamide

(1E)-N′-[9-[(3aR,4S,6R,6aR)-Hexahydro-4-(hydroxymethyl)-2-oxo-3-(phenylmethyl)furo[3,4-d]oxazol-6-yl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-N,N-dimethylmethanimidamide

(1E)-N′-[9-[(3aR,4S,6R,6aR)-4-[[[(1,1-Dimethylethyl)diphenylsilyl]oxy]methyl]hexahydro-2-oxo-3-(phenylmethyl)furo[3,4-d]oxazol-6-yl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-N,N-dimethylmethanimidamide

(1E)-N′-[9-[3-Bromo-3-deoxy-5-O-[(1,1-dimethylethyl)diphenylsilyl]-2-O-[[(phenylmethyl)amino]carbonyl]-β-D-xylofuranosyl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-N,N-dimethylmethanimidamide

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

(1E)-N′-[9-[2-O-Acetyl-3-bromo-3-deoxy-5-O-[(1,1-dimethylethyl)diphenylsilyl]-β-D-xylofuranosyl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-N,N-dimethylmethanimidamide

[N(E)]-N-[(Dimethylamino)methylene]-5′-O-[(1,1-dimethylethyl)diphenylsilyl]guanosine

3′-Amino-3′-deoxy-2′-O-[(1,1-dimethylethyl)dimethylsilyl]-N-(2-methyl-1-oxopropyl)guanosine

N-Benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-deoxy-2′-O-[(1,1-dimethylethyl)dimethylsilyl]-3′-[(Z)-(phenylmethylene)amino]adenosine

5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-3′-deoxy-2′-O-[(1,1-dimethylethyl)dimethylsilyl]-3′-[(Z)-(phenylmethylene)amino]adenosine

5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-3′-deoxy-2′-O-[(1,1-dimethylethyl)dimethylsilyl]-3′-[(phenylmethyl)amino]adenosine

5′-O-[Bis(4-methoxyphenyl)phenylmethyl]-3′-deoxy-3′-[(phenylmethyl)amino]adenosine

N-[9-[(3aR,4S,6R,6aR)-4-[[Bis(4-methoxyphenyl)phenylmethoxy]methyl]hexahydro-2-oxo-3-(phenylmethyl)furo[3,4-d]oxazol-6-yl]-9H-purin-6-yl]-2-methylpropanamide

N-[9-[(3aR,4S,6R,6aR)-Hexahydro-4-(hydroxymethyl)-2-oxo-3-(phenylmethyl)furo[3,4-d]oxazol-6-yl]-9H-purin-6-yl]-2-methylpropanamide

N-[9-[(3aR,4S,6R,6aR)-4-[[[(1,1-Dimethylethyl)diphenylsilyl]oxy]methyl]hexahydro-2-oxo-3-(phenylmethyl)furo[3,4-d]oxazol-6-yl]-9H-purin-6-yl]-2-methylpropanamide

(3S)-1-[Bis(1-methylethyl)amino]-5-fluoro-1,3-dihydro-3-methyl-1-isobenzofuranol