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6-ACETYL-2-(4-BROMO-PHENYL)-5-METHYL-3-OXO-2,3-DIHYDRO-PYRIDAZINE-4-CARBONITRILE 6-ACETYL-2-(4-BROMO-PHENYL)-5-METHYL-3-OXO-2,3-DIHYDRO-PYRIDAZINE-4-CARBONITRILE