2,3-Dihydro-5H-indeno(1,2-c)pyridazin-3-one 5-24-04-00012 (Beilstein Handbook Reference) 5H-Indeno(1,2-c)piridazin-3-one [Italian] 5H-Indeno(1,2-c)pyridazin-3-one, 2,3-dihydro- 69581-16-4 BRN 0781755