An Efficient Synthesis of 6-Formyl-l,2-dihydro-2-oxo-3-pyridinecarboxylic Acid and some Carbonyl Derivatives of it and its 6-Acetyl Homologue
Joseph P. Sanchez, Thomas F. Mich, Gin G. Huang
Journal of heterocyclic chemistry, 1994, Volume 31, pp. 297-303
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https://www.jhetchem.com/cd2html.php?file=19940297