Fatty acid composition methyl butyrate is a fatty acid methyl ester. The chemical formula of fatty acid methyl ester is C5H 1 1COOCH3. It is a colorless liquid and smells like alcohol. Methyl butyrate is usually produced by the reaction of butyric acid and methanol catalyzed by acid. Methyl butyrate is a common methyl ester compound, widely used in food, medicine, chemistry and other fields. In food industry, methyl butyrate is often used as food essence and flavor enhancer, which can increase the taste and fragrance of food. In pharmaceutical industry, methyl butyrate can be used as raw material and solvent for drugs. In chemical industry, methyl butyrate can be used to synthesize other compounds, such as butanol and butyraldehyde.