The molecule is a methyl glycoside that is beta-D-Gal-(1->4)-[beta-D-Gal-(1->4)-beta-D-Glc-(1->6)]-beta-D-GlcNAc in which the CH2OH of the galactose within the trisaccharide chain is replaced by anionic carboxylate and the hydroxy group at the reducing-end anomeric centre is methylated. It is a methyl glycoside and a carbohydrate acid derivative anion. It derives from a beta-D-Galp-(1->4)-[beta-D-Galp-(1->4)-beta-D-Glcp-(1->6)]-beta-D-GlcpNAc.
(2S,3R,4S,5R,6R)-6-[(2R,3S,4R,5R,6R)-6-[[(2R,3S,4R,5R,6R)-5-acetamido-4-hydroxy-6-methoxy-3-[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]methoxy]-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylate