7-(2-(3,3-Dimethylguanidino)ethyl)theophylline hydrochloride 85460-98-6 N,N-Dimethyl-N'-(beta-(theophyllinyl-7)ethyl)guanidine hydrochloride Theophylline, 7-(2-(3,3-dimethylguanidino)ethyl)-, monohydrochloride