Fructose

A hexose with a keto group, also called a keto-hexose. Aside from the keto group, each of the 5 remaining carbons has one hydroxyl group, in the S,R, and R configuration counting from the first hydroxyl containing asymmetric carbon next to the ketone in the straight chain (=Fisher) projection. All other carbons are bound to hydrogen exclusively. Occurs mostly as furan and rarely as pyran or straight chain. When fructose forms a ring an additional ""anomeric"" asymmetric carbon is created which is denoted as ""alpha"" or ""beta"". For isomers see http://en.wikipedia.org/wiki/fructose. (NCI Thesaurus/CRCH)

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