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| Other names | 7-MX; 7-Methylxanthin; Heteroxanthin; Heteroxanthine; NSC-7861 |
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| Formula | C6H6N4O2 |
| Molar mass | 166.140 g·mol−1 |
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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.