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4-??-2-??-2H-???-3-?????

4-??-2-??-2H-???-3-????? ??? ???

???(??):: 4-methyl-2-oxochromene-3-carboxylic acid;4-Methyl-2-oxo-2H-chromene-3-carboxylic acid;2H-1-Benzopyran-3-carboxylic acid, 4-methyl-2-oxo-

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4-??-2-??-2H-???-3-????? ??

Journal of the American Chemical Society, 75, p. 1886, 1953 DOI: 10.1021/ja01104a032

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