3-Methylbutanoic acid instance of short-chain fatty acid
3-Methylbutanoic acid, also known as β-methylbutyric acid or more commonly isovaleric acid, is a branched-chain alkyl carboxylic acid with the chemical formula (CH3)2CHCH2CO2H.  It is classified as a short-chain fatty acid. Like other low-molecular-weight carboxylic acids, it has an unpleasant odor.  The compound occurs naturally and can be found in many foods, such as cheese, soy milk, and apple juice.History
3-Methylbutanoic acid is a minor constituent of the perennial flowering plant valerian (Valeriana officinalis), from which it got its trivial name isovaleric acid: an isomer of valeric acid which shares its unpleasant odor.  The dried root of this plant has been used medicinally since antiquity. Their chemical identity was first investigated in the 19th century by oxidation of the components of fusel alcohol, which includes the five-carbon amyl alcohols.
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