9-((2R,3R,4S,5R)-4-hydroxy-5-(((4-methoxyphenyl)diphenylmethoxy)methyl)-3-((4-methoxytetrahydro-2H-pyran-4-yl)oxy)tetrahydrofuran-2-yl)-2-(((4-methoxyphenyl)diphenylmethyl)amino)-1,9-dihydro-6H-purin-6-one