9-[(2R,3R,4R,5R)-4-[[(1,1-Dimethylethyl)dimethylsilyl]oxy]-5-ethenyl-3-fluorotetrahydro-2-furanyl]-1,9-dihydro-2-[(2-methylpropyl)amino]-6H-purin-6-one

(2R,3R,3aS,9aR)-2-(2,2-Difluoroethyl)-2,3,3a,9a-tetrahydro-3-hydroxy-6H-furo[2′,3′:4,5]oxazolo[3,2-a]pyrimidin-6-one

Guanosine, 2′,3′-O-[(1,1-dimethylethyl)dimethylsilyl]-5′-thio-

Guanosine, 2′,3′-O-(1-methylethylidene)-5′-thio-

Guanosine, 5′-deoxy-N-(2-methyl-1-oxopropyl)-2′-O-[(2-nitrophenyl)methyl]-5′-[(5-nitro-2-pyridinyl)dithio]guanylyl-(3′→5′)-2′,3′-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-N-(2-phenoxyacetyl)-