7-Methylxanthine (Standard) is the analytical standard of 7-Methylxanthine. This product is intended for research and analytical applications. 7-Methylxanthine is an orally active methyl derivative of xanthine and a non-selective adenosine receptor antagonist. 7-Methylxanthine is also one of the purine components of human urinary calculi. 7-Methylxanthine has anti-myopia activity[1].