The molecule is a branched twelve-membered oligosaccharide phosphate consisting of one galactose residue, three glucose residues, two 3-deoxy-D-manno-oct-2-ulosonic acid residues, three L-glycero-alpha-D-manno-heptose residues and three 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 F653.
(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)-4-[(2R,3R,4R,5S,6R)-3-amino-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3-[(2R,3R,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)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