Ketose (source code)

= Ketose
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A <ketose> is a <monosaccharide> whose open-chain form contains a <ketone> group. <Fructose> is a familiar example, with a carbonyl group at carbon 2 in its open-chain structure.

A <ketose> can form cyclic structures by reaction of its carbonyl group with one of its own <hydroxyl groups>. The distinction from an <aldose> concerns carbonyl connectivity, rather than simply the number of <carbon> atoms.<Organic Chemistry by John McMurry/25.1 Classification of Carbohydrates>[Aldoses and ketoses]{ref}