?-D-GlcpNAc-(1->?)-?-D-Gal?-(1->?)-?-D-Glcp-(1->?)[?-D-GlcpNAc-(1->?)-L-gro-?-D-manHepp7PEtn-(1->?)]-L-gro-?-D-manHepp-(1->?)-?-D-Kdop(2->