Now, the enzyme that basically catalyzed this step is the l three hydroxy acyl coenzyme A dehydronase. And it only acts on the substrate molecule if it's the l isomer. And that's why this step is so important. It has to form the l isomer and not the deisomer, because if this was the deisomer, this specific enzyme would not be able to actually bind that substrate molecule. Now, once we carry out the second oxidation step, this molecule is now ready to actually be cleaved. So in the final step, we have a cleavage by coenzyme A.