2,4,4a,5-Tetrahydro-2-methyl-3H-indeno(1,2-c)pyridazin-3-one 2-Methyl-2,4,4a,5-tetrahydro-3H-indeno(1,2-c)pyridazin-3-one 3H-Indeno(1,2-c)pyridazin-3-one, 2,4,4a,5-tetrahydro-2-methyl- 5-24-03-00497 (Beilstein Handbook Reference) 69099-77-0 BRN 0786086