7-methylxanthine 7-methylxanthine 7-methylxanthine (7-mx), also known as heteroxanthine, is an active metabolite of caffeine (1,3,7-trimethylxanthine) and theobromine (3,7-dimethylxanthine). it is a non-selective antagonist of the adenosine receptors. the compound may slow the progression of myopia (nearsightedness). it is under investigation for this purpose in children with myopia. 7-methylxanthineclinical dataother names7-mx; 7-methylxanthin; heteroxanthin; heteroxanthine; nsc-7861identifiers iupac name 7-methyl-3h-purine-2,6-dione cas number552-62-5pubchem cid68374chemspider61660uniie9m81njm6gkeggc16353chebichebi:48991chemblchembl321248chemical and physical dataformulac6h6n4o2molar mass166.140 g·mol−13d model (jsmol)interactive image smiles cn1c=nc2=c1c(=o)nc(=o)n2 inchi inchi=1s/c6h6n4o2/c1-10-2-7-4-3(10)5(11)9-6(12)8-4/h2h,1h3,(h2,8,9,11,12)key:pfwlfwpasulgan-uhfffaoysa-n