1-Propyl-3-isobutyl-8-methylxanthine 1H-Purine-2,6-dione, 3,7-dihydro-8-methyl-3-(2-methylpropyl)-1-propyl- 3,7-Dihydro-8-methyl-3-(2-methylpropyl)-1-propyl-1H-purine-2,6-dione 81250-25-1