2(1H)-Quinolinone, 3,4-dihydro-1-methyl-6-(1,4,5,6-tetrahydro-4-methyl-6-oxo-3-pyridazinyl)- 3,4-Dihydro-1-methyl-6-(1,4,5,6-tetrahydro-4-methyl-6-oxo-3-pyridazinyl)-2(1H)-quinolinone 70386-06-0 Y 590 Y-590