alpha-D-NeupAc-(2->3)-beta-D-Galp-(1->3)[beta-D-Galp6S-(1->4)-beta-D-GlcpNAc6S-(1->3)-beta-D-Galp-(1->4)-beta-D-GlcpNAc6S-(1->6)]-?-D-GalpNAc(1->