?-D-GalpNAc-(1->?)-?-D-Galp-(1->?)-?-D-Glcp-(1->?)[?-D-GlcpNAc-(1->?)-L-gro-?-D-manHepp7PEtn-(1->?)]-L-gro-?-D-manHepp-(1->?)-D-Kdo(?->