The molecule is an amino trisaccharide consisting of a 3-deoxy-D-manno-oct-2-ulose residue and two glucosamine residues (one at the reducing end) in a linear sequence, with three phosphate groups attached. Isolated from the lipopolysaccharide obtained from Haemophilus influenzae.
(2R,4R,5S,6R)-2-[[(2R,3S,4R,5R,6R)-5-amino-6-[[(2R,3S,4R,5R,6R)-5-amino-3,4-dihydroxy-6-phosphonooxyoxan-2-yl]methoxy]-4-hydroxy-3-phosphonooxyoxan-2-yl]methoxy]-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxy-4-phosphonooxyoxane-2-carboxylic acid