So we have carbon one, carbon two, carbon three, carbon four, carbon five, and this oxygen. And that's why we call it a pyrenose. The glucose simply means we begin with the deglucose. So this is the ring form of that glucose molecule. Now, what is the meaning of the beta. Well, if we examine this carbon number one, the beta simply means that the hydroxyl group of this carbon number one, known as the anumeric carbon, points in the same direction as this group here that is bound onto carbon number five.