The molecule is a trisaccharide that is alpha-D-glucopyranosyl-(1->3)-D-galactopyranose in which the hydroxy group at position 4 of the D-galactopyranose moiety has been glycosylated by an alpha-L-fucopyranosyl group. It derives from an alpha-D-Glcp-(1->3)-D-Galp.
(2S,3S,4R,5S,6S)-2-[(2R,3S,4R,5R)-5,6-dihydroxy-2-(hydroxymethyl)-4-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-3-yl]oxy-6-methyloxane-3,4,5-triol