(E)-8-(3,4,5-Trimethoxystyryl)theophylline hemihydrate 147700-34-3 1H-Purine-2,6-dione, 3,7-dihydro-1,3-dimethyl-8-(2-(3,4,5-trimethoxyphenyl)ethenyl)-, (E)-, hydrate (2:1)