?-D-GalpNAc-(1->?)-?-D-Galp-(1->?)-?-D-GlcpNAc-(1->?)[?-D-Galp-(1->?)-?-D-GlcpNAc-(1->?)]-?-D-Galp-(1->?)-?-D-GlcpNAc-(1->?)-?-D-GalpNAc-(1->
