The molecule is a branched twelve-membered oligosaccharide phosphate consisting of three galactose residues, two glucose residues, two 3-deoxy-D-manno-oct-2-ulosonic acid residues, three L-glycero-alpha-D-manno-heptose residues and two glucosamine residues, one of which is at the reducing end. The unit constitutes one of the two core oligosaccharide structures of enterobacterial lipopolysaccharide obtained from E. coli strain F470.
(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-[(2S,3S,4R,5R,6R)-6-[(1S)-1,2-dihydroxyethyl]-4-[(2R,3S,4R,5R,6R)-6-[(1S)-2-[(2S,3S,4S,5S,6R)-6-[(1S)-1,2-dihydroxyethyl]-3,4,5-trihydroxyoxan-2-yl]oxy-1-hydroxyethyl]-4-[(2R,3R,4S,5R,6R)-4-[(2R,3R,4S,5R,6R)-3-[(2R,3R,4S,5R,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-6-(hydroxymethyl)-4-[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3-hydroxy-5-phosphonooxyoxan-2-yl]oxy-3-hydroxy-5-phosphonooxyoxan-2-yl]oxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid