And unlike an oxygenase, where one of the oxygen atoms was used to form water, and the other oxygen atom went onto the phenolalanine to form the tyrosine, an enzyme that we call dioxygenase uses a diatomic water, a diatomic oxygen, and it uses both atoms of that diatomic oxygen to attach it onto that substrate molecule. So in this step, we basically want to remove this carbon dioxide, and we want to use both of the oxygen atoms and attach them onto this substrate to basically form an intermediate we call homogenesate. So the enzyme that catalyze this step is p hydroxy phenyl, Pyruvate dioxygenase. And so ultimately, we attach an oxygen here onto this carbon, and the other oxygen goes onto this ring here. So now we have two oxygen atoms here, two oxygen atoms here, and this carbon dioxide group was basically removed as carbon dioxide. Now, in the next step, we want to use, yet again, a dioxygenase.