3-Deoxy--manno-oct-2-ulosonic acid (ketodeoxyoctonic acid; KDO; IUPAC symbol Kdo) is a monosaccharide, specifically an ulosonic acid of a 2-ketooctose. In gram-negative bacteria it is a component of the core oligosaccharide portion of lipopolysaccharides, also known as endotoxin.
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