[alpha-D-GlcpN-(1->7)-[alpha-L-GalpA2N-(1->6)-alpha-D-GlcpN-(1->4)-beta-D-Glcp-(1->3)]-beta-D-GlcpA-(1->2)-L-gro-alpha-D-manHep?-(1->5)]-?-L-3-deoxy-manOct2ulop-onic(2->