114915-73-0 2,4,4a,5-Tetrahydro-7-(methylamino)-3H-indeno(1,2-c)pyridazin-3-one 3H-Indeno(1,2-c)pyridazin-3-one, 2,4,4a,5-tetrahydro-7-(methylamino)- 7-Methylamino-4,4a-dihydro-5H-indeno(1,2-c)pyridazin-3-one