(E)-1,3-Diethyl-8-(3-fluoro-2-methylstyryl)-7-methylxanthine hemihydrate 155272-02-9 1H-Purine-2,6-dione, 3,7-dihydro-1,3-diethyl-8-(2-(3-fluoro-2-methylphenyl)ethenyl)-7-methyl-,(E)-, hydrate (2:1)