(E)-8-(3,4-Dimethoxystyryl)-7-propargyl-1,3-dipropylxanthine 155814-25-8 1H-Purine-2,6-dione, 3,7-dihydro-8-(2-(3,4-dimethoxyphenyl)ethenyl)-1,3-dipropyl-7-(2-propynyl)-, (E)-