3-甲基鸟嘌呤

7-benzyl-3-methylguanine

5-(N-cyanomethylamino)-1-β-D-ribofuranosylimidazole-4-carboxamide

5-(methylamino)-1-β-D-ribofuranosyl-1H-imidazole-4-carboxamide

3-methylguanosine