The molecule is an organophosphate oxoanion obtained by the deprotonation of the carboxy and phospho groups and protonation of the amino group of O-(N-acetylglucosamine-1-phosphoryl)-L-serine: major species at pH 7.3. It is a conjugate base of an O-(N-acetylglucosamine-1-phosphoryl)-L-serine.
(2S)-3-[[(3R,4R,5S,6R)-3-acetamido-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-oxidophosphoryl]oxy-2-azaniumylpropanoate