1,7-Dimethylxanthine 1H-Purine-2,6-dione, 3,7-dihydro-1,7-dimethyl- (9CI) 3,7-Dihydro-1,7-dimethyl-1H-purine-2,6-dione 5-26-13-00554 (Beilstein Handbook Reference) 611-59-6 BRN 0197907 EINECS 210-271-9 NSC 400018 Paraxanthine Xanthine, 1,7-dimethyl- p-Xanthine