1-Piperazineethanol, alpha-(1,3-dimethyl-7-xanthinylmethyl)-4-(1-naphthobenzyl)-, dihydrochloride 19972-07-7 Theophylline, 7-(2-hydroxy-3-(4-naphthobenzyl-1-piperazinyl)propyl)-, dihydrochloride