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