So let's take a look at a specific example of a keto hexose, basically a six carbon sugar molecule that contains a ketone group. And the example we're going to look at is defractose. So, in defuctose, we also have 123456 carbon atoms, just like in this particular case. But instead of having the aldehyde, we have this ketone group. And so now what takes place is this hydroxyl group on the fifth carbon. So this hydroxyl group on the fifth carbon here reacted with the first carbon.