?-D-GalpNAc-(1→?)-?-D-GlcpNAc-(1→?)-?-D-Manp-(1→?)[?-D-GlcpNAc-(1→?)-?-D-Manp4/6S-(1→?)]-?-D-Manp-(1→?)-?-D-GlcpNAc-(1→?)-?-D-GlcpNAc-(1→
