The complex is known as hydroxy ethyl. TPP complex or simply hydroxy ethyl TPP. And we also generate that carbon dioxide that we have right here. Now, once we form the hydroxy ethyl TPP, this same enzyme, Pyruvate dehydrogenase, also catalyzes the next step, an oxidation reduction step. Now, what basically happens is this molecule here is oxidized. So this is the oxidizing agent while this structure is reduced.