[beta-D-GlcpNAc-(1->4)-[beta-D-GlcpNAc-(1->2)-alpha-L-Manp-(1->?)]-[beta-D-GlcpNAc-(1->6)-beta-D-GlcpNAc-(1->2)-alpha-L-Manp-(1->?)]-beta-L-Manp-(1->4)]-beta-D-GlcpNAc-(1->4)-?-D-GlcpNAc(1->