114915-66-1 2,4,4a,5-Tetrahydro-8-nitro-3H-indeno(1,2-c)pyridazin-3-one 3H-Indeno(1,2-c)pyridazin-3-one, 2,4,4a,5-tetrahydro-8-nitro- 8-Nitro-4,4a-dihydro-5H-indeno(1,2-c)pyridazin-3-one