(E)-1,3-Diethyl-8-(3-methoxy-2-nitrostyryl)-7-methylxanthine 155271-57-1 1H-Purine-2,6-dione, 3,7-dihydro-1,3-diethyl-8-(2-(3-methoxy-2-nitrophenyl)ethenyl)-7-methyl-,(E)-