So because acetoacetate is a beta ketoacid, it will undergo a slow and spontaneous reaction in which it will decarboxylate itself. And so we release a carbon dioxide, this molecule here, to form an acetone. And this takes place spontaneously without using any enzyme. Now, acetone cannot actually be metabolized by our bodies. So we do not use acetone to form any energy molecules. And what happens to acetone is it's simply released via the lungs, via breathing.