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