Ara(a1-3)[GlcA(a1-2)[Ara(a1-3)[GlcA(a1-2)[[4)Xyl(b1-4)]Xyl(b1-4)Xyl(b1-4)Xyl(b1-4)]Xyl(b1-4)]Xyl(b1-4)Xyl(b1-4)Xyl(b1-4)]Xyl(b1-4)Xyl(b1-]n