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