1,3,8,8-Tetramethylxanthine 1H-Purine-2,6-dione, 3,7-dihydro-1,3,8,8-tetramethyl- 5-26-14-00181 (Beilstein Handbook Reference) 715-59-3 8,8-Dimethyl-8H-theophyllin [German] BRN 0615610 GD 054 Xanthine, 1,3,8,8-tetramethyl-