?-D-GlcpNAc-(1→?)-?-?-Manp-(1→?)[?-D-GlcpNAc-(1→?)-?-?-Manp-(1→?)][?-?-Xylp-(1→?)]-?-?-Manp-(1→?)-?-D-GlcpNAc-(1→?)-?-D-GlcpNAc-(1→
