125068-54-4 3(2H)-Pyridazinone, 4,5-dihydro-5-methyl-6-(4-((2-methyl-3-oxo-1-cyclopenten-1-yl)amino)phenyl)- 4,5-Dihydro-5-methyl-6-(4-((2-methyl-3-oxo-1-cyclopentenyl)amino)phenyl)-3-(2H)-pyridazinone Nsp 805 Nsp-805