(E)-1,3-Diallyl-8-(3,4-dimethoxystyryl)-7-methylxanthine 155814-28-1 1H-Purine-2,6-dione, 3,7-dihydro-8-(2-(3,4-dimethoxyphenyl)ethenyl)-1,3-di-2-propenyl-7-methyl-, (E)-