Neu5Ac(a2-3)[Neu5Ac(a2-6)Gal(b1-4)]GlcNAc(b1-2)Man(a1-?)[Neu5Ac(a2-6)Gal(b1-?)GlcNAc(b1-2)Man(a1-?)]Man(b1-4)GlcNAc(b1-4)GlcNAc(b1-