Methylated xanthine derivatives include caffeine, paraxanthine, theophylline, and theobromine. These drugs inhibit phosphodiesterase and antagonise adenosine. Xanthines are also found very rarely as constituents of nucleic acids.
|Name||R1||R2||R3||IUPAC nomenclature||Found In|
|Caffeine||CH3||CH3||CH3||1,3,7-trimethyl-1H-purine-2,6(3H,7H)-dione||Coffee, Guarana, Yerba mate, Tea|
|Theobromine||H||CH3||CH3||3,7-dihydro-3,7-dimethyl-1H-purine-2,6-dione||Chocolate, Yerba mate|
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