So at the second carbon position to form the two, three BPG. And that two, three BPG doesn't exist for a very long period of time because it's not very stable. It has too much charge in close proximity. So if we place two phosphoryl groups in close proximity, that increases the energy of that molecule. And that's why the two three BPG is higher in energy than this molecule or this molecule. And so what that means is it's not going to exist for a very long time.