beta-D-Galp-(1->4)-beta-D-GlcpNAc-(1->3)-beta-D-Galp-(1->4)-beta-D-GlcpNAc-(1->3/6)[beta-D-GlcpNAc-(1->2/3/4)-beta-D-Galp-(1->3/6)]-?-D-GalpNAc(1->
