1-(6-Pyridazinyl)piperazine (CAS No.51047-56-4), it also can be called 3-(1-Piperazinyl)pyridazine ; 3-(Piperazin-1-yl)pyridazin ; Pyridazine, 3-(1-piperazinyl)- ; 1-(6-Pyridazinyl)piperazine .