The molecule is a lipid A(4-) obtained by deprotonation of the four phosphate OH groups of the lipid A obtained from E. coli; major species at pH 7.3. It is a conjugate base of a lipid A (E. coli).
[(2R,3S,4R,5R,6R)-5-[[(3R)-3-dodecanoyloxytetradecanoyl]amino]-6-[[(2R,3S,4R,5R,6R)-3-hydroxy-5-[[(3R)-3-hydroxytetradecanoyl]amino]-4-[(3R)-3-hydroxytetradecanoyl]oxy-6-phosphonatooxyoxan-2-yl]methoxy]-2-(hydroxymethyl)-4-[(3R)-3-tetradecanoyloxytetradecanoyl]oxyoxan-3-yl] phosphate