And that's why we call these furnose furnishes. Now, what I haven't actually shown is a second type of reaction can actually take place. So in the case of the defurctose, in the case of all keto hexosis, actually, we can also have under certain circumstances, we can have the hydroxyl group on the 6th carbon attack the carbon of the carbonyl nucleophilically. And if this hydroxyl group on the 6th carbon attacks this carbon, instead of forming our five member ring, we're going to form a six membered ring. So for deflectose, a second reaction can take place in the second reaction, not shown on the board, the hydroxyl of the six carbon. This one will react with the Ketone group carbon number two, nucleophilically, to form a five membrane ring.