The molecule is an amino tetrasaccharide antigen consisting of two 3-deoxy-D-manno-oct-2-ulose residues and two glucosamine residues (one at the reducing end) in a linear sequence, with two phosphate groups attached. It has a role as an antigen.
(2R,4R,5R,6R)-2-[(2R,4R,5R,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]-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid