3(2H)-Pyridazinone, 6,6'-(1,4-piperazinediyl)bis-, dihydrazone 5-25-18-00061 (Beilstein Handbook Reference) 56393-13-6 6,6'-(1,4-Piperazinediyl)bis-3(2H)-pyridazinone dihydrazone BRN 0713944