Gaxilose, also known as 4-Galactosylxylose, a synthetic disaccharide and a substrate of intestinal lactase. Gaxilose is used in a new noninvasive diagnostic test based on urine or serum measurement of D-xylose after lactase cleavage of orally administered
6-O-beta-D-Galactopyranosyl-D-galactose, a disaccharide, is a constituent of the polysaccharide backbone characterized by beta-(1→6) glycoside linkages, with a side chain attached to the primary chain through a beta-(1→3) bond.