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We have achieved the chemical synthesis of the repeating units of four serotypes group B Streptococcus capsular polysaccharides and the dimers. The sialotrisaccharide moiety, α- Neu5Ac-(2→3)-β-D-Gal-(1→4)-β-D-GlcNAc, which is a quite common motif in natural glycans, had low reactivity as a glycosyl donor, thus it can only be used to glycosylate reactive glycosyl acceptors.