?-6-deoxy-?-Hex?-(1->?)-?-?-Hex?-(1->?)-?-?-Hex?NAc-(1->?)[?-6-deoxy-?-Hex?-(1->?)-?-?-Hex?-(1->?)-?-?-Hex?NAc-(1->?)]-?-?-Hex?NAc-(1->
