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. So we have a second coenzyme A molecule that comes into the reaction and it uses its thyl group to actually cleave the bond between the second, the alpha carbon and the third carbon, the beta carbon. And because it's the thyl group of the coenzyme A that is acting as a nucleophile and cleaving that bond this cleavage is known as a Thiolytic cleavage of bico enzyme A. Now, the enzyme that catalyzes the final step of this process is the beta keto thylase enzyme.