(E)-8-(3-Bromo-4-methoxystyryl)-1,3-diethyl-7-methylxanthine 155271-49-1 1H-Purine-2,6-dione, 3,7-dihydro-8-(2-(3-bromo-4-methoxyphenyl)ethenyl)-1,3-diethyl-7-methyl-,(E)-