The molecule is a glycosylgalactose consisting of an alpha-L-fucopyranose residue and a D-galactopyranose residue joined in sequence by a (1->4) glycosidic bond. It derives from an alpha-L-fucose and a D-galactopyranose.
(2S,3S,4R,5S,6S)-2-methyl-6-[(2R,3R,4R,5R)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxane-3,4,5-triol