N-[9-[(1S,3R,4R,5S)-4-[Bis(4-methoxyphenyl)phenylmethoxy]-1-(hydroxymethyl)-2-oxabicyclo[3.1.0]hex-3-yl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-2-methylpropanamide

N-[9-[(1S,3R,4R,5S)-4-[Bis(4-methoxyphenyl)phenylmethoxy]-1-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]-2-oxabicyclo[3.1.0]hex-3-yl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-2-methylpropanamide

N-[9-[(1S,3R,4R,5S)-1-[[[(1,1-Dimethylethyl)dimethylsilyl]oxy]methyl]-4-hydroxy-2-oxabicyclo[3.1.0]hex-3-yl]-6,9-dihydro-6-oxo-1H-purin-2-yl]-2-methylpropanamide

N-[6,9-Dihydro-9-[(1S,3R,4R,5S)-4-hydroxy-1-(hydroxymethyl)-2-oxabicyclo[3.1.0]hex-3-yl]-6-oxo-1H-purin-2-yl]-2-methylpropanamide