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Sorry, this answer is incorrect. Butyric
acid is not the substance responsible for the agonizing itch caused by poison ivy. Butyric acid is a foul smelling, liquid carboxylic acid. It is a fatty acid that is found in butter and cheeses and it gives rancid butter its unpleasant smell. It is used in the manufacture of pharmaceuticals, disinfectants, emulsifying agents, and plastics. Interestingly, butyric acid esters have very pleasant odors and are used food additives and in personal care products.
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