So let's take a look at the structure of this lactose molecule. So notice the linkage, just like in this particular case, is also between the first carbon of the first sugar molecule and the fourth carbon of the second sugar molecule. But notice that our bond on this anomaly, carbon of the first sugar, is or has the beta arrangement. And what that means is this bond points upward in the same direction as this group, which also points upward. And that's why we call it the beta anamer of D galactose. And because of this, this linkage is known as the beta one four glycositic bond.