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6-Oxo-1,4,5,6-tetrahydropyridazin-3-carboxylic acid27372-38-9100 % similar 3-tert-Butyl-4,5-dihydro-1H-pyrazol-5-one29211-68-534 % similar 3-Propyl-1,4-dihydropyrazol-5-one29211-70-933 % similar Oxalic acid144-62-732 % similar