1H-Purine-2,6-dione, 3,7-dihydro-7-(3-((2-(3,4-dihydroxyphenyl)ethyl)amino)butyl)-1,3-dimethyl-, hydrochloride 67553-51-9 7-(3-(2-(3,4-Dihydroxyphenyl)ethylamino)butyl)theophylline hydrochloride