The molecule is a linear pentasaccharide consisting of a beta-D-galactose residue, three L-glycero-alpha-D-manno-heptose residues and (at the reducing end) a 3-deoxy-alpha-D-manno-oct-2-ulopyranosonic acid (Kdo) residue linked sequentially (1->2), (1->2), (1->3) and (1->5); the structure is that of the pentasaccharide epitope from Haemophilus influenzae MAHI 4. 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]-4,5-dihydroxy-3-[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-4,5-dihydroxyoxan-2-yl]oxy-3,5-dihydroxyoxan-2-yl]oxy-2,4-dihydroxyoxane-2-carboxylic acid