Abstract: The present invention addresses the problem of providing a novel oligosaccharide, which is a biantennary glycan having an ?2,6-sialic acid structure at a non-reducing end, and a method for producing the oligosaccharide, and an intermediate thereof, and a method for producing the intermediate. Provided are a novel oligosaccharide represented by the following formula A-22, a method for producing the oligosaccharide shown in FIG. 1, and an intermediate thereof and a method for producing the intermediate.

Abstract: The objective of the invention is to provide a novel oligosaccharide, which can be used for producing a biantennary glycan having an ?2,6-sialic acid structure at a non-reducing end, a method for production thereof, production intermediates thereof and a method for producing the intermediates, as well as a novel oligosaccharide, which is a biantennary glycan having an ?2,6-sialic acid structure at a non-reducing end, a method for producing the oligosaccharide, intermediates thereof, and a method for producing the intermediates. Provided are a novel oligosaccharide represented by Formula A-13 or D-13: a method for producing the oligosaccharide represented by Formula A-13 or Formula D-13 shown in, for example, FIG. 1 or FIG. 3, intermediates thereof and a method for producing the intermediates.

Abstract: The present invention addresses the problem of providing: a novel method for pure-chemically producing a biantennary N-glycan with an ?2,6-sialic acid structure at each non-reducing end, the method having excellent yield, selectivity, and efficiency; and a method for producing a novel monosaccharide or oligosaccharide, which are useful in the method, and, for instance, intermediates as well as a novel method for producing the glycoprotein or the like by using the method.