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3,6-Dihydroxy-4,5-dimethylpyridazine 4,5-Dihydro-6-methylpyridazin-3(2H)-one 6-(4-Aminophenyl)-4,5-dihydro-5-methyl-3(2H)-pyridazinone 4-METHYL-3(2H)-PYRIDAZINONE Pimobendan 4,5-DICHLORO-2-METHYLPYRIDAZIN-3-ONE 3(2H)-Pyridazinone 5,6-dimethyl-3-oxo-2H-pyridazine-4-carbonitrile 4-CHLORO-5-ETHOXY-2-METHYL-3(2H)-PYRIDAZINONE 6-(4-METHOXYSTYRYL)-2-METHYL-3(2H)-PYRIDAZINONE