The molecule is an oligosaccharide derivative that is a undecasaccharide derivative, the oligosaccharide portion of the Proteus penneri strain 13 lipopolysaccharide (LPS) core region. Structural variations can occur: the alpha-LD-Hep substituent linked (1->7) to alpha-LD-Hep6PEtn may be further substituted (1->7) by a beta-D-GalAN residue; if so, then the [alpha-LD-Hep-(1->2)-alpha-DD-Hep branch linked (1->2) to alpha-D-GalA may be absent.
(2R,4R,5R,6R)-2-[(2R,4R,5R,6R)-5-[(2R,3S,4R,5R,6R)-4-[(2S,3S,4S,5S,6S)-4-[(2S,3R,4S,5R,6S)-5-[(2R,3R,4R,5R,6R)-3-amino-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-6-carboxy-3-[(2R,3S,4S,5S,6R)-6-[(1R)-1,2-dihydroxyethyl]-3-[(2R,3S,4S,5S,6R)-6-[(1S)-1,2-dihydroxyethyl]-3,4,5-trihydroxyoxan-2-yl]oxy-4,5-dihydroxyoxan-2-yl]oxy-4-hydroxyoxan-2-yl]oxy-6-[(1S)-1-[2-aminoethoxy(hydroxy)phosphoryl]oxy-2-[(2R,3S,4S,5S,6R)-6-[(1S)-1,2-dihydroxyethyl]-3,4,5-trihydroxyoxan-2-yl]oxyethyl]-3,5-dihydroxyoxan-2-yl]oxy-6-[(1S)-1,2-dihydroxyethyl]-3-hydroxy-5-[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-[(1R)-2-[(2R,3R,4S,5S)-5-amino-3,4-dihydroxyoxan-2-yl]oxy-1-hydroxyethyl]-2-carboxy-2-hydroxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid