7-[3-(4-Butyl-1-piperazinyl)-2-hydroxypropyl]theophyline

7-[3-(4-Butyl-1-piperazinyl)-2-hydroxypropyl]theophylline

7-[3-(4-Butyl-1-piperazinyl)-2-hydroxypropyl]-3,7-dihydro-1,3-dimethyl-1H-purine-2,6-dione