The molecule is an amino disaccharide that is that is the 3-O-beta-D-galactopyranoside of 2-amino-2-deoxy-beta-D-galactopyranose. It is a beta-D-galactoside and an amino disaccharide.
(2R,3R,4S,5R,6R)-2-[(2R,3R,4R,5S,6R)-3-amino-2,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol