Kdo(a2-4)[Glc(b1-2)GlcN(b1-3)[Gro(a1-7)Gro(a1-7)]Gro(a1-3)[Glc(b1-4)]Gro(a1-5)]Kdo(a2-6)GlcN(b1-6)GlcN(a1-