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