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A study of the properties of pyridinecarboxylic acids having carboxyl and carbonyl groups in positions 2 and 3
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Chemistry of Heterocyclic Compounds
[DOI: 10.1007/BF00471242]
Sako, M., Science of Synthesis, (2004) 16, 1119..
Condensation of Pyridine-2,3-dicarbonyl Compounds with Hydrazines
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Science of Synthesis