1H-Purine-2,6-dione, 3,7-dihydro-1,3-dimethyl-8-(1-methylethyl)- (9CI) 2850-40-0 8-Isopropyl theophylline 8-Isopropyltheophylline NSC 14303 Theophylline, 8-isopropyl- Xanthine, 1,3-dimethyl-8-isopropyl-