Ketohexose A ketose SUGAR with six carbon atoms, e.g. fructose.

一碳的糖。例如果糖。

Glucose cyclizes to form asix- membered pyranose ring whilst five –carbon surgars and six-carbon ketose sugars (ketohexoses) such as fructnose rings.

环状结构 碳糖和更大的糖能环化，醛与糖的另一碳原子上的羟反应。