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3(2H)-Pyridazinone Dichloroacetonitrile Pymetrozine SULFACHLOROPYRIDAZINE 4,5-DICHLORO-2-METHYLPYRIDAZIN-3-ONE 1-PHENYL-4,5-DICHLORO-6-PYRIDAZONE 4,5-DICHLORO-2-(3,5-DICHLOROPHENYL)-2,3-DIHYDROPYRIDAZIN-3-ONE Pyridazine 2-(3-CHLORO-4-FLUOROPHENYL)-4,5-DICHLORO-PYRIDAZINE-3-(2H)-ONE 2-BENZYL-4,5-DICHLORO-2,3-DIHYDROPYRIDAZIN-3-ONE