1,4-Dihydro-1-(4-chlorophenyl)-6-methyl-4-oxo-3-pyridazinecarboxylic acid potassium salt 3-Pyridazinecarboxylic acid, 1,4-dihydro-1-(4-chlorophenyl)-6-methyl-4-oxo-, potassium salt 83588-43-6 Caswell No. 723J EPA Pesticide Chemical Code 119001 Fenridazon potassium Fenridazon-potassium Hybrex Potassium 1-(4-chlorophenyl)-1,4-dihydro-6-methyl-4-oxopyridazine-3-carboxylate Potassium 1-(p-chlorophenyl)-1,4-dihydro-6-methyl-4-oxopyridazine-3-carboxylate RH 0007