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4-Pyridazinecarboxylic acid Pyridazin-3-ylmethanol 3-Pyridazinecarboxylic acid methyl ester 3-cinnolinecarboxaldehyde 6-Chloropyridazine-3-carboxylic acid 3-Pyridazinecarboxylic acid 3,6-PYRIDAZINEDICARBOXYLIC ACID DIETHYL 5,6-DIPHENYL-3,4-PYRIDAZINEDICARBOXYLATE 3-Cinnolinecarboxylic acid, 4-amino-8-fluoro-, hydrate