Examples of typical oligosaccharide having only a glucopyranose ring as a heterocyclic ring are: disaccharides such as maltose, cellobiose, lactose, isomaltose, and chitotriose; trisaccharides such as cellotriose, maltotriose and chitotriose and tetrasaccharides and other oligosaccharides having more than 4 monosaccharides such as chitotetraose, cellotetraose, cellopentaose, chitopentaose, chitohe