The molecule is a linear oligosaccharide phosphate comprising an N-acetyl-alpha-D-glucosamine residue,an L-glycero-alpha-D-manno-heptose residue phosphoethanolamine-substituted on O-3, another L-glycero-alpha-D-manno-heptose residue and a 3-deoxy-D-manno-oct-2-ulosonic acid (2-keto-3-deoxy-D-mannooctanoic acid, Kdo) in a (1->2), (1->3), (1->5) sequence. Corresponds to the icsb mutant of the core oligosaccharide of Neisseria meningitidis. It is an oligosaccharide phosphate and an amino tetrasaccharide.
(4R,5R,6R)-5-[(2R,3S,4S,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]-3,5-dihydroxyoxan-2-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-2,4-dihydroxyoxane-2-carboxylic acid