The molecule is a disaccharide that is alpha-D-galactopyranose in which the hydroxy group at position 6 has been converted into the corresponding alpha-L-fucoside. It is a glycoside and a glycosylgalactose. It derives from an alpha-D-galactose and an alpha-L-fucose.
(2S,3R,4S,5R,6R)-6-[[(2R,3S,4R,5S,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxymethyl]oxane-2,3,4,5-tetrol