Pyranose is a chemical structure that is comprised of a ring.
The ring is made up of six members that contain 5 Carbon and 1 Oxygen atom.
The pyranose ring of glucose is formed by reacting the hydroxyl group positioned on the fifth Carbon of glucose with the aldehyde group attached to the first position of the Carbon atom of the same glucose molecule.
The name pyranose is derived from the heterocyclic ring which consists of a cyclic structure of 5 Carbon and 1 Oxygen atom called pyran.