Maleic

malonic acid is very well known. Succinic and maleic acids should work as well. Check out BRENDA database

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... fungi, and can be extracted from their sources by treatment with acids (usually hydrochloric acid or sulfuric acid, though organic acids such as maleic acid and citric acid are sometimes used). Usually alkaloids are derivatives of amino acids. Even though many alkaloids are poisonous (such as ...

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