Pyranose is a collective term for
carbohydrates that have a chemical structure that includes a six-membered ring consisting of five carbon atoms and one oxygen atom. There may be other carbons external to the ring. The name derives from its similarity to the oxygen heterocycle
pyran, but the pyranose ring does not have
double bonds. A pyranose in which the anomeric OH at C(l) has been converted into an OR group is called a pyranoside.