Kdo(a2-4)[GlcN(a1-2)Gro(a1-3)[Gal(b1-4)GlcN(b1-3)Gal(b1-4)Glc(b1-4)]Gro(a1-5)]Kdo(a2-6)GlcN(b1-6)GlcN(?1-