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