The molecule is a linear tetrasaccharide consisting of three L-glycero-alpha-D-manno-heptosyl residues and a 3-deoxy-alpha-D-manno-oct-2-ulosonic acid (Kdo) residue linked sequentially (1->2), (1->2) and (1->5); corresponds to the tetrasaccharide epitope from Haemophilus influenzae MAHI 3. It has a role as an epitope.
(2R,4R,5R,6R)-6-[(1R)-1,2-dihydroxyethyl]-5-[(2R,3S,4S,5R,6R)-6-[(1S)-1,2-dihydroxyethyl]-4-[(2R,3S,4S,5S,6R)-6-[(1S)-1,2-dihydroxyethyl]-3-[(2R,3S,4S,5S,6R)-6-[(1S)-1,2-dihydroxyethyl]-3,4,5-trihydroxyoxan-2-yl]oxy-4,5-dihydroxyoxan-2-yl]oxy-3,5-dihydroxyoxan-2-yl]oxy-2,4-dihydroxyoxane-2-carboxylic acid