title: Preparation of some N-methyl isoquanines via 6-methyl-thio-2-oxopurines, and of 8-methylisoquanine.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D006147:Guanine / Q000031:analogs & derivatives* / Q000138:chemical synthesis; D006863:Hydrogen-Ion Concentration; D008722:Methods; D008745:Methylation; D011687:Purines; D013056:Spectrophotometry, Ultraviolet
chemical_list: D011687:Purines; D006147:Guanine