The chemical reactions and pathways resulting in the formation of verbascose, the pentasaccharide beta-D-fructofuranosyl alpha-D-galactopyranosyl-(1->6)-alpha-D-galactopyranosyl-(1->6)-alpha-D-galactopyranosyl-(1->6)-alpha-D-glucopyranoside.
Source:MetaCyc:CPD-8065,
GOC:mah