1H-Purine-2,6-dione, 3,7-dihydro-7-(4-(4-(4-chlorophenyl)-1-piperazinyl)butyl)-1,3-dimethyl-, 7-(4-(4-(p-Chlorophenyl)-1-piperazinyl)butyl)theophylline dihydrochloride 7-(4-(4-(p-Chlorophenyl)piperazinyl-(1))-n-butyl)-theophyllin dihydrochlorid [German] 87798-85-4 Theophylline, 7-(4-(4-(p-chlorophenyl)-1-piperazinyl)butyl)-, dihydrochloride