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'''Isovaleric Acid''', also known as 3-Methylbutanoic acid, is an organic compound with the formula (CH3)2CHCH2CO2H. The flavor and aroma are often described as rancid Parmesan, or foot odor. It is not to be confused with [[Butyric Acid]], which specifically has a more bile or vomit aroma and flavor.
==Production in Beer and Wine==