23237-83-4 7-(3-(4-Allyl-1-piperazinyl)propyl)theophylline dihydrochloride Piperazine, 1-allyl-4-(1,3-dimethyl-7-xanthinyl)propyl- Theophylline, 7-(3-(4-allyl-1-piperazinyl)propyl)-, dihydrochloride