are glycosides where the aglycone is another sugar. the anomeric carbon of a sugar can react with any of the hydroxyl groups of another sugar, but there are only three bonding rearrangements that are common: a 1,4' link; a 1,6' link; and a 1,1' link. the numbers refer to the carbon numbers on the sugars. the linkages are called glycosidic linkages. will only react with Tollens reagent if there is an anomeric carbon that is not involved in a glycosidic bond and is free to react.