'''Butyric acid''' (CH<sub>3</sub>(CH<sub>2</sub>)<sub>2</sub>COOH) is a [[fatty acid]] commonly found in rotten [[butter]], parmesan [[cheese]], and [[vomit]]. It has an unpleasant smell which can be detected by humans in concentrations of 10 parts per million (ppm). | '''Butyric acid''' (CH<sub>3</sub>(CH<sub>2</sub>)<sub>2</sub>COOH) is a [[fatty acid]] commonly found in rotten [[butter]], parmesan [[cheese]], and [[vomit]]. It has an unpleasant smell which can be detected by humans in concentrations of 10 parts per million (ppm). |