Patent ID: 7851618

Claim:
A glycopeptide comprising an aminated complex-type oligosaccharide of the formula (1) wherein R 1 is —NH—(CO)—CH 2 X, X being a halogen atom, R 2 and R 3 are a hydrogen atom or a group of the formulae (2) to (5) and may be the same or different, except that R 2 and R 3 are not both hydrogen or the formula (5) at the same time and when one of R2 and R3 is hydrogen, the other is not the formula (5), and the aminated complex-type oligosaccharide is bound to a thiol group of a peptide by displacement of halogen X of NH—(CO)—CH 2 X further wherein the glycopeptide has about 12 times higher resistance to Peptide-N Glycosidase F (PNGase F) than the glycopeptide comprising said aminated complex-type oligosaccharide of formula (1), wherein R1 is an asparagine.