The molecule is a branched oligosacharide consisting of a tetrasaccharide chain of deamino-alpha-neuraminyl (KDN), beta-D-galactosyl, N-acetyl-alpha-D-galactosaminyl and N-acetyl-D-galactosamine residues linked sequentially (2->3), (1->3) and (1->3), to the reducing-end N-acetyl-D-galactosamine residue of which is also linked (2->6) a single KDN or a (2->8)-linked chain of KDN residues, the number of KDN residues in the chain ranging between 1 and 9, with an average of 3. The diagram shows the structure with 3 KDN residues in the side-chain.
(2R,4S,5R,6R)-2-[[(2R,3R,4R,5R)-5-acetamido-4-[(2S,3R,4R,5R,6R)-3-acetamido-4-[(2R,3R,4S,5S,6R)-4-[(2R,4S,5R,6R)-2-carboxy-4,5-dihydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxan-2-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-5-hydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3,6-dihydroxyoxan-2-yl]methoxy]-6-[(1R,2R)-2-[(2R,4S,5R,6R)-2-carboxy-6-[(1R,2R)-2-[(2R,4S,5R,6R)-2-carboxy-4,5-dihydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxan-2-yl]oxy-1,3-dihydroxypropyl]-4,5-dihydroxyoxan-2-yl]oxy-1,3-dihydroxypropyl]-4,5-dihydroxyoxane-2-carboxylic acid