So we want to transform the Dmethylmel coenzyme into the l methylmelanyl coenzyme A. Why? Well, because the enzyme in the last third step of this process, it uses, it only uses the l isomer and not the deisomer. So the enzyme that catalyzes step number two, the conversion of the deisomer into the l isomer is methylmalcoenzyme a racimase. And so we transform the Dmethyl malnol coenzyme A in which we have this methyl group pointing out of the board into this l isomer form in which the methyl group is now pointing into the board. And the reason is because the enzyme in the third step, the methyl malanyl coenzyme A mutase, only acts on the l isomer and not on the deisomer.