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"Heating these anacardic acids converts them to the alcohols (cardanols), but does not destroy their activity[6] unless high heat is used, which decarboxylates them"
When you remove a COO from anacardic acid (i.e. decarboxylate it) you get cardanol. You can not decraboxylate cardanol, because it is not a COO-acid.
Is eating cashew nuts anti-caries, preventing S.Mutans in mouth?