1H-Purine-2,6-dione, 3,7-dihydro-1,3-diethyl-8-(2-(4-hydroxyphenyl)eth enyl)-7-methyl-, (E)-

1H-Purine-2,6-dione, 3,7-dihydro-8-(2-(3,4-dimethoxyphenyl)ethenyl)-1, 3-di-2-propenyl-7-methyl-, (E)- (E)-7-Methyl-8-(3,4-methylenedioxystyryl)-1,3-dipropylxanthine 3-Desmethyl Istradefylline (E)-8-(4-(4-bromobutoxy)styryl)-1,3-diethyl-7-methylxanthine (E)-8-(2-(4-Methoxynaphthyl)vinyl)-7-methyl-1,3-dipropylxanthine

(E)-1,3-Dipropyl-7-methyl-8-(2-(4-propoxyphenyl)ethenyl)-3,7-dihydro-1 H-purine-2,6-dione 1H-Purine-2,6-dione, 3,7-dihydro-8-(2-(4-(4-aminobutoxy)phenyl)ethenyl )-1,3-diethyl-7-methyl-,(E)- 1H-Purine-2,6-dione, 3,7-dihydro-1,3-diethyl-8-(2-(4-hydroxyphenyl)eth enyl)-7-methyl-, (E)- 1H-Purine-2,6-dione, 3,7-dihydro-8-(2-(3,4-bis(methoxymethoxy)phenyl)e thenyl)-1,3-dipropyl-7-methyl-, (E)- Acetic acid, (4-(2-(1,3-diethyl-2,3,6,7-tetrahydro-7-methyl-2,6-dioxo- 1H-purin-8-yl)ethenyl)phenoxy)-, ethyl ester, (E)-

1H-Purine-2,6-dione, 3,7-dihydro-8-(2-(2-bromo-4,5-dimethoxyphenyl)eth enyl)-1,3-diethyl-7-methyl-, (E)- 1H-Purine-2,6-dione, 3,7-dihydro-1,3-diethyl-8-(2-(7-methoxy-1,3-benzo dioxol-5-yl)ethenyl)-7-methyl-, (E)- 1H-Purine-2,6-dione, 3,7-dihydro-1,3-diethyl-8-(2-(4,5-dimethoxy-2-nit rophenyl)ethenyl)-7-methyl-, (E)- 1H-Purine-2,6-dione, 3,7-dihydro-8-(2-(2-chloro-3,4-dimethoxyphenyl)et henyl)-1,3-diethyl-7-methyl-, (E)- (E)-8-(2-(1,4-Benzodioxan-6-yl)vinyl)-7-methyl-1,3-dipropylxanthine

(E)-8-(2-(4-Butoxyphenyl)ethenyl)-1,3-dipropyl-7-methyl-3,7-dihydro-1H -purine-2,6-dione