(E)-8-(2-Chloro-3,4-dimethoxystyryl)-1,3-diethyl-7-methylxanthine 155271-43-5 1H-Purine-2,6-dione, 3,7-dihydro-8-(2-(2-chloro-3,4-dimethoxyphenyl)ethenyl)-1,3-diethyl-7-methyl-, (E)-