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== S-, N-, C-, and O-glycosidic bonds == [[Image:Adenosin.svg|thumb|200px|[[Adenosine]], a component of [[RNA]], results from the sugar [[ribose]] and [[adenine]] via the formation of an N-glycosidic bond (shown as the vertical line between the N and the sugar cycle)]] Glycosidic bonds of the form discussed above are known as '''O-glycosidic bonds''', in reference to the glycosidic [[oxygen]] that links the glycoside to the aglycone or reducing end sugar. In analogy, one also considers '''S-glycosidic bonds''' (which form '''thioglycosides'''), where the oxygen of the glycosidic bond is replaced with a [[sulfur]] atom. In the same way, '''N-glycosidic bonds''', have the glycosidic bond oxygen replaced with [[nitrogen]]. Substances containing N-glycosidic bonds are also known as [[glycosylamine]]s. '''C-glycosyl''' bonds have the glycosidic oxygen replaced by a [[carbon]]; the term "C-glycoside" is considered a misnomer by [[IUPAC]] and is discouraged.<ref>{{cite web |url=http://www.sbcs.qmul.ac.uk/iupac/2carb/33.html |title=Nomenclature of Carbohydrates (Recommendations 1996) |author=<!--Not stated--> |website=Department of Chemistry, Queen Mary University of London }}</ref> All of these modified glycosidic bonds have different susceptibility to hydrolysis, and in the case of C-glycosyl structures, they are typically more resistant to hydrolysis.
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