The molecule is a tetrasaccharide that is lactose in which the hydroxy groups at the 3 and 2' positions have each been glycosylated by an alpha-L-fucosyl group.
(2S,3S,4R,5S,6S)-2-[(2S,3R,4S,5R,6R)-2-[(2R,3R,4R,5R)-5,6-dihydroxy-2-(hydroxymethyl)-4-[(2S,3S,4R,5S,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-3-yl]oxy-4,5-dihydroxy-6-(hydroxymethyl)oxan-3-yl]oxy-6-methyloxane-3,4,5-triol