Acetoin is a product of fermentation. It is a component of the butanediol cycle in microorganisms. In mammals it is oxidized to carbon dioxide. -- Pubchem; '3-Hydroxybutanone, also known as acetoin or acetyl methyl carbinol, is a chemical compound composed of carbon, hydrogen and oxygen. Its formula is C4H8O2. It is a colourless or pale yellow to green yellow liquid with a pleasant buttery odour. It is used as a food flavoring and a fragrance. -- Wikipedia .
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