(E)-8-(3,4-Dimethoxystyryl)-1,3-diethyl-7-methylxanthine 155270-99-8 1H-Purine-2,6-dione, 3,7-dihydro-1,3-diethyl-8-(2-(3,4-dimethoxyphenyl)ethenyl)-7-methyl-, (E)- Istradefylline Istradefylline [USAN:INN] KW 6002 KW-6002