2,5-Dihydro-7-fluoro-3H-indeno(1,2-c)pyridazin-3-one 3H-Indeno(1,2-c)pyridazin-3-one, 2,5-dihydro-7-fluoro- 7-Fluoro-5H-indeno(1,2-c)piridazin-3-one [Italian] 81198-18-7