. . . . . . . . . . . . . . . . . "A product of fermentation. It is a component of the butanediol cycle in microorganisms. In mammals it is oxidized to carbon dioxide. [PubChem]"@en . . . . . . . . . . . . "experimental"@en . . . . "R,3-Hydroxybutan-2-One"@en . . .