preferred_name: 2-acetamido-2-deoxy-alpha-D-glucopyranosyluronic acid-(1->4)-[2-amino-2-deoxy-beta-D-glucopyranosyl-(1->7)]-3-deoxy-alpha-D-manno-oct-2-ulopyranonosidonic acid-(2->5)-2-(3-amino)propyl-3-deoxy-alpha-D-manno-oct-2-ulopyranosidonic acid