107550-40-3 2-((Tetrahydro-2-furanyl)amino)-7-((tetrahydro-2-furanyl)oxy)-1,7-dihydro-6H-purin-6-one 6H-Purin-6-one, 1,7-dihydro-2-((tetrahydro-2-furanyl)amino)-7-((tetrahydro-2-furanyl)oxy)-