The molecule is a tetrasaccharide composed of three alpha-D-Kdo residues and one acetylated beta-glucosamine residue (at the reducing end). It is a partial structure of chlamydial lipopolysaccharide (LPS). It is an alpha-D-Kdo-(2->8)-alpha-D-Kdo-(2->4)-alpha-D-Kdo-(2->6)-D-GlcNAc and a glucosamine oligosaccharide.
(2R,4R,5R,6R)-2-[(2R)-2-[(2R,3R,4R,6R)-6-[(2R,4R,5R,6R)-2-[[(2R,3S,4R,5R,6R)-5-acetamido-3,4,6-trihydroxyoxan-2-yl]methoxy]-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxyoxan-4-yl]oxy-6-carboxy-3,4-dihydroxyoxan-2-yl]-2-hydroxyethoxy]-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid