Furanose
A furanose is a carbohydrate monosaccharide that is a five-membered (5 carbon) ring. The name furanose is due to its similarity to furan[1]. Furanose is formed from the open-chain form of fructose cyclized to a five-membered ring when the C-5 hydroxyl group attacks the C-2 ketone to form an intramolecular hemiketal. Two anomers are possible, which are α anomer and β anomer[2].