A trisaccharide found in triterpenoidsaponinsisolatedfrom Pullsatilla roots appears as an important promoiety for the enhancement of anticancer activity of their aglycones. Thus a facile synthetic method for a trisaccharide moiety, allyl-2,3,4-tri-O-benzoyl-alpha-L-rhamnopyranosyl-(1-->2)-[2,3,4,6-tetra-O-benzoyl-beta-D-glucopyranosyl-(1-->4)]-3-O-benzoyl-beta-L-arabinopyranoside (3), has been firstly