80446-84-0 Methyl 4-O-alpha-D-galactopyranosyl-beta-D-Galactopyranoside Methyl 4-O-galactopyranosylgalactopyranoside Methyl-4-galabioside Methyl-D-galabioside beta-D-Galactopyranoside, methyl 4-O-alpha-D-galactopyranosyl-