So in the second step, we have the enzyme in oil, coenzyme A. hydratase adds a hydroxyl group onto the beta carbon, and this creates the l isomer version of hydroxy acyl coenzyme A. Now let's move on to the third step. In the third step, we have a second oxidation step actually taking place. So this was the first oxidation step, and this is the second oxidation step. And in this particular case, the molecule that is basically abstracting those electrons is not Fad, but it's NAD plus. So nicotine amide, adenine dinucleotide.