The term FRUCTOSE, TO GLUCOSE is an isomer, which is a molecule that has the same chemical formula as another molecule but a different arrangement of atoms. Fructose and glucose are two isomers of the same molecule, with the same chemical formula but different arrangements of atoms. Fructose is a monosaccharide, or simple sugar, found in many fruits and vegetables, while glucose is a monosaccharide found in the bloodstream and used by cells for energy.