Benzyl 2-acetamido-2-deoxy-4-O-(b-D-galactopyranosyl)-b-D-glucopyranoside is an oligosaccharide that is synthesized from D-(+)-galactose, D-(+)-glucose and benzyl alcohol. This product can be used for the modification of saccharides and has been shown to have a high purity. It has been fluorinated at the alpha position and glycosylated with acetamidobenzoyl group.