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An oligosaccharide is a carbohydrate formed by two or more monosaccharides.

If both monosaccharides are pyranose types, they can bond through ($\alpha$ or $\beta$)1-4 or ($\alpha$ or $\beta$)1-6. If one monosaccharide of them is of furanose type, they can bond through ($\alpha$ or $\beta$)1-2.

Examples:

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or

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  • Is any other type of glycosidic bond type between monosaccharides in oligosaccharides that occurs naturally not in the lab?
Another.Chemist
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    If you have $n$ hydroxy groups on one sugar, you can form $4n$ glycosidic bonds with the anomeric centre of the other sugar. I’m willing to bet that examples can be found for almost each ‘variant’. – Jan Jan 07 '17 at 19:16

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