(E)-8-(3-Hydroxy-4-methoxystyryl)-7-methyl-1,3-dipropylxanthine 151539-57-0 1H-Purine-2,6-dione, 3,7-dihydro-1,3-dipropyl-8-(2-(3-hydroxy-4-methoxyphenyl)ethenyl)-7-methyl-, (E)-