coumalic acid
noun
cou·mal·ic acid
(ˈ)kü¦malik-,
-mā-
variants
or less commonly cumalic acid
(ˈ)kyü-
: a white crystalline acid C6H4O4 formed by heating malic acid with sulfuric acid or zinc chloride; 5-coumalin-carboxylic acid
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Merriam-Webster unabridged
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