Furanose
![Beta-d-Fructofuranose](/Images/godic/202501/14/Beta-D-Fructofuranose.svg4750.png")
![The chemical structure of ribose in its furanose form. The wavy bond indicates a mixture of β-ribofuranose and α-ribofuranose.](/Images/godic/202501/14/Ribofuranose-2D-skeletal4750.png")
A furanose is a collective term for carbohydrates that have a chemical structure that includes a five-membered ring system consisting of four carbon atoms and one oxygen atom. The name derives from its similarity to the oxygen heterocycle furan, but the furanose ring does not have double bonds.