14535-83-2 1H-Purine-2,6-dione, 3,7-dihydro-7-(2-((2-hydroxy-1-methyl-2-phenylethyl)amino)ethyl)-1,3-dimethyl- (VAN) 22550-86-3 7-(2-(1-Methyl-2-hydroxy-2-phenylethylamino)ethyl)theophylline monohydrochloride Norephendrinetheophylline