69440-61-5 9-(2,3-Dihydroxypropyl)-2-(4-piperonyl-1-piperazinyl)-9H-purine dihydrochloride 9H-Purine, 9-(2,3-dihydroxypropyl)-2-(4-piperonyl-1-piperazinyl)-, dihydrochloride, hemihydrate