An unknown trisaccharide was treated with methanol in HCl (to methylate its free OH groups) then subjected to acid hydrolysis (to break glycosidic bonds). The products were 2, 3, 4, 6-tetra-O-methylgalactose, 2, 3, 4-tri-O-methylglucose, and 2, 3, 6-tri-O methylglucose. Treatment of the intact trisaccharide with β(1→6)-galactosidase yielded D-galactose and a disaccharide. Treatment of this disaccharide with α(1→4)-glucosidase yielded D-glucose. Draw the structure of this trisaccharide and give its systematic name.