1H-Purine-2,6-dione, 3,7-dihydro-3-(2-methylpropyl)- 3,7-Dihydro-3-(2-methylpropyl)-1H-purine-2,6-dione 3-Isobutylxanthine 63908-37-2 BRN 0538505 D 4030 Xanthine, 3-isobutyl- (7CI)