The molecule is a disaccharide that is L-fucopyranose in which the hydroxy group at position 4 has been converted into the corresponding alpha-D-galactopyranoside. It is a glycoside and an alpha-D-galactoside. It derives from a hydride of a L-fucopyranose.
(3S,4S,5S,6S)-6-methyl-5-[(2R,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxane-2,3,4-triol