The molecule is an organophosphate oxoanion arising from deprotonation of the phosphate OH groups of lactose 6-phosphate; major species at pH 7.3. It is a conjugate base of a lactose 6'-phosphate.
[(2R,3R,4S,5R,6S)-3,4,5-trihydroxy-6-[(2R,3S,4R,5R)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl phosphate