The osones from glucose, mannose, and fructose are identical.
For the structural (stereochemical) relations of fructose see Sugar.
Slator supposes that glucose and fructose form the same compound with the enzyme.
Fructose is one of the sweetest of sugars, and helps to give honey its great sweetness.
There are two common in foods, glucose and fructose; a third, galactose, ...