Synthesis of a novel glycosaminoglycan pentasaccharide serine having anN-acetylgalactosamine residue?-linked to the core linkage tetrasaccharide

Abstract
A novel pentaosyl serine; GalNAcα(1–4)GlcAβ(1–3)Galβ(1–3)Galβ(1–4)Xylβ(1–3)Ser (2), a putative intermediate of chondroitin sulfate and/or heparan sulfate biosynthesis, was synthesized.