?-D-Galp-(1->?)-?-D-GlcpNAc-(1->?)-?-D-GalpA-(1->?)-?-D-QuipNAc-(1->?)[?-D-Galp-(1->?)]-?-D-GlcpNAc-(1->?)-?-D-GalpA-(1->?)-D-QuiNAc(?->