β-D-Ribofuranuronic acid, 1,2-dideoxy-1-[1,6-dihydro-2-[(2-methyl-1-oxopropyl)amino]-6-oxo-9H-purin-9-yl]-3-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-, 1,1-dimethylethyl ester
β-D-Ribofuranuronic acid, 1,2-dideoxy-1-[1,6-dihydro-2-[(2-methyl-1-oxopropyl)amino]-6-oxo-9H-purin-9-yl]-3-O-[(1,1-dimethylethyl)dimethylsilyl]-2-fluoro-, 1,1-dimethylethyl ester