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Wiktionary
isobutyric acid

n. (context fatty acid English) 2-methyl-propanoic acid, (CH3)2CHCOOH, an isomer of butyric acid, that occurs in carob beans and croton oil.

Wikipedia
Isobutyric acid

Isobutyric acid, also known as 2-methylpropanoic acid, is a carboxylic acid with structural formula ( C H)-CH- COOH.

It is found in the free state in carobs ( Ceratonia siliqua), in vanilla and in the root of Arnica dulcis, and as an ethyl ester in croton oil.

Isobutyric acid is an isomer of n- butyric acid; they have the same chemical formula C H O but a different structure.