The molecule is a branched oligosaccharide phosphate comprising a D-glucose residue, an N-acetyl-D-glucosamine residue, two L-glycero-D-manno-heptose residues (one of which is phosphoethanolamine-substituted on O-3), with linkages as shown and with a 3-deoxy-D-manno-oct-2-ulosonic acid (2-keto-3-deoxy-D-mannooctanoic acid, Kdo) residue at the reducing end. Corresponds to the galE mutant of the core oligosaccharide of Neisseria meningitidis. It is an oligosaccharide phosphate and an amino pentasaccharide.
(4R,5R,6R)-5-[(2S,3S,4R,5R,6R)-4-[(2R,3S,4S,5R,6R)-3-[(2R,3R,4R,5S,6R)-3-acetamido-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4-[2-aminoethoxy(hydroxy)phosphoryl]oxy-6-[(1S)-1,2-dihydroxyethyl]-5-hydroxyoxan-2-yl]oxy-6-[(1S)-1,2-dihydroxyethyl]-3-hydroxy-5-[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-2,4-dihydroxyoxane-2-carboxylic acid