The molecule is a twelve-membered branched glucosamine oligosaccharide made up from three alpha-D-glucose residues, one alpha-D-glucosamine residue, one alpha-D-galactose residue, three L-alpha-D-Hep residues (two of which are monophosphorylated), two alpha-Kdo residues and two monophosphorylated alpha-D-glucosamine residues (one of which is at the reducing end). Corresponds to the dodecasaccharide of E. coli R2 lipopolysaccharide (LPS). It is an amino oligosaccharide, a glucosamine oligosaccharide and an oligosaccharide phosphate.
(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]-5-[(2S,3S,4R,5R,6R)-4-[(2R,3S,4R,5R,6R)-4-[(2R,3R,4S,5R,6R)-4-[(2R,3R,4S,5S,6R)-3-[(2R,3R,4S,5S,6R)-3-[(2R,3R,4R,5S,6R)-3-amino-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3,5-dihydroxy-6-[[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]oxan-2-yl]oxy-6-[(1S)-2-[(2S,3S,4S,5S,6R)-6-[(1S)-1,2-dihydroxyethyl]-3,4,5-trihydroxyoxan-2-yl]oxy-1-hydroxyethyl]-3-hydroxy-5-phosphonooxyoxan-2-yl]oxy-6-[(1S)-1,2-dihydroxyethyl]-3-hydroxy-5-phosphonooxyoxan-2-yl]oxy-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]oxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid