2,3,4,4a-Tetrahydro-5H-indeno(1,2-C)pyridazin-3-one 5-24-03-00497 (Beilstein Handbook Reference) 5H-Indeno(1,2-c)pyridazin-3-one, 2,3,4,4a-tetrahydro- 69099-74-7 BRN 0781715