(E)-8-(4-Methoxy-2,3-dimethylstyryl)caffeine 155271-17-3 1H-Purine-2,6-dione, 3,7-dihydro-8-(2-(2,3-dimethyl-4-methoxyphenyl)ethenyl)-1,3,7-trimethyl-,(E)- 8-(2,3-Dimethyl-4-methoxystyryl)-1,3,7-trimethylxanthine KF 21213 KF-21213 KF21213