93495-81-9 PGGG Propyl O-beta-galactopyranosyl-(1-4)-O-beta galactopyranosyl-(1-4)-alpha galactopyranoside alpha-D-Galactopyranoside, propyl O-beta-D-galactopyranosyl-(1-4)-O-beta-D-galactopyranosyl-(1-4)-, (3beta)-