1-((2-Methyl-5-methylene-5-oxotetrahydrofuran-2-yl)methyl)guanine 1-Mmofg 105970-04-5 6H-Purin-6-one, 2-amino-1,7-dihydro-1-((tetrahydro-2-methyl-4-methylene-5-oxo-2-furanyl)methyl)-