preferred_name: [4)-beta-D-GlcA-(1->4)-beta-D-GlcA2(or 3)Ac-(1->4)-beta-D-Glc-(1->4)-[(R)-4,6-CH3(COO(-))C-beta-D-Gal3(or 2)OHb-(1->3)-beta-D-Glc-(1->4)-beta-D-Glc-(1->4)-beta-D-Glc-(1->6)]-alpha-DGlc2(or 3)Ac-(1->]n