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3-PYRIDAZINECARBALDEHYDE,97% Pyridazin-3-ylmethanol Methyl 4,6-dihydroxypyridazine-3-carboxylate METHYL 6-CHLOROPYRIDAZINE-3-CARBOXYLATE 6-Chloro-pyridazine-3-carboxylic acid ethyl ester DIETHYL 5,6-DIPHENYL-3,4-PYRIDAZINEDICARBOXYLATE Methyl 4,6-dichloropyridazine-3-carboxylate 3-Pyridazinecarboxylic acid, 6-(butylamino)-, methyl ester