The molecule is a trisaccharide consisting of alpha-L-fucopyranose and beta-D-galactose residues joined by a (1->4) glycosidic bond in which the hydroxy group at position 3 of the galactopyranose ring has been converted into the corresponding beta-D-glucopyranosyl derivative.
(2S,3S,4R,5S,6S)-2-[(2R,3S,4R,5R)-5,6-dihydroxy-2-(hydroxymethyl)-4-[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-3-yl]oxy-6-methyloxane-3,4,5-triol