1H-Purine-2,6-dione, 3,7-dihydro-1,3-dimethyl-8-(2-methylpropyl)- 5770-30-9 8-Isobutyl theophylline NSC101801 Theophylline, 8-isobutyl- WLN: T56 BM DN FNVNVJ C1Y1&1 F1 H1 Xanthine, 1,3-dimethyl-8-isobutyl-