13117-26-5 4-O-alpha-D-galactopyranosyl-D-galactose D-Galactose, 4-O-alpha-D-galactopyranosyl- Digal Gal alpha 1-4 gal beta Gal-1-4-gal Galabiose Galactosyl-alpha1-4-galactose alpha-D-Galactopyranose-(1-4)-beta-D-galactopyranose