The molecule is a branched amino tetrasaccharide and oligosaccharide phosphate comprising an N-acetyl-D-glucosamine residue, a D-glucose residue and two L-glycero-D-manno-heptose residues (one of which is phosphoethanolamine-substituted on O-3 and O-6), with linkages as shown. It is an amino tetrasaccharide and an oligosaccharide phosphate.
[(1S)-1-[(2S,3R,4S,5S,6S)-5-[(2R,3R,4R,5S,6R)-3-acetamido-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4-[2-aminoethoxy(hydroxy)phosphoryl]oxy-6-[(2R,3R,4R,5S,6S)-2-[(1S)-1,2-dihydroxyethyl]-5,6-dihydroxy-3-[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-4-yl]oxy-3-hydroxyoxan-2-yl]-2-hydroxyethyl] 2-aminoethyl hydrogen phosphate