[?-D-GlcpNAc-(1->?)-[?-D-GlcpNAc-(1->?)-?-L-Manp-(1->?)]-[?-D-GlcpNAc-(1->?)-?-L-Manp-(1->?)-?-D-GlcpNAc-(1->?)-?-L-Manp-(1->?)]]-?-D-GlcpNAc-(1->?)-?-D-GlcpNAc(1->