Kansas 66045. acid, and one or more phenyl hydroxyl groups that may become methylated to produce methoxy groups. Phenolic acids commonly occur as esters and/or ethers in combination with various sugars and aliphatic or aromatic acids and hydroxy acids. Most plant phenolic acids are derivatives of either benzoic (benzenecarboxylic; Cg-C^o r cinnamic (phenylpropanoid or phenylacrylic; C6-C3) acids (Roston and Kissinger, 1982).
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