Patent ID: 8158763

Claim:
An asparagine-linked α2,3-oligosaccharide derivative having undeca- to hepta-saccharides containing fluorine and represented by the formula (1) given below wherein R 1 and R 2 are each a hydrogen atom or one of the groups represented by the formulae (2) to (5) given below and may be the same or different, provided that one of R 1 and R 2 should always be the group of the formula (2) wherein R, R′ and R″ are in the following combinations: (a) R=F, R′=OH, R″=OH; (b) R=OH, R′=F, R″=OH; (c) R=OH, R′=OH, R″=F; or (d) R=OH, R′=OH, R″=OH;