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Reference.org
Paraxanthine
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<p>Paraxanthine, also known as 1,7-dimethylxanthine, is an <a href="/facts/Isomer/PXlvDVdg">isomer</a> of <a href="/facts/Theophylline/qJzjQVB2">theophylline</a> and <a href="/facts/Theobromine/1L7mWzQ4">theobromine</a>, two well-known <a href="/facts/Stimulant/nmBdAXM5">stimulants</a> found in <a href="/facts/Coffee/Q4Ko2C7I">coffee</a>, <a href="/facts/Tea/oDQhcyrc">tea</a>, and <a href="/facts/Chocolate/4drs8ryf">chocolate</a>, mainly in the form of <a href="/facts/Caffeine/Hx6E2QC5">caffeine</a>. It is a member of the <a href="/facts/Xanthine/3ARA2QCg">xanthine</a> family of <a href="/facts/Alkaloids/m6hUXohz">alkaloids</a>, which also includes <a href="/facts/Theophylline/qJzjQVB2">theophylline</a> and <a href="/facts/Theobromine/1L7mWzQ4">theobromine</a> in addition to caffeine. </p>