Neu5Ac(a2-3)Gal(b1-?)GlcNAc(b1-?)[Neu5Ac(a2-3)Gal(b1-?)GlcNAc(b1-?)]Man(a1-?)[Man(a1-?)[Man(a1-?)]Man(a1-?)]Man(b1-4)GlcNAc(b1-4)GlcNAc(?1-