So remember, what we did in this step here is we hydrolyzed the high energy ATP molecule, and we use that energy to actually carboxylate this acetyl coenzyme A to form this malcoenzyme A. Now, what we do here is a decarboxylation step, and we break a thio ester bond. And this pretty much releases enough energy for us to actually drive this reactant forward. So this step is a crucial step in fatty acid synthesis because it drives the overall reaction forward. What happens is the enzyme acyl, malno ACP condensing enzyme, basically decarboxylates this group, and that prepares these two molecules for nucleophilic attack. So this nucleophilically attacks this, and that breaks this thioester bond that releases a good amount of free energy, so lowers the free energy of this product molecule, and that helps drive the equilibrium toward the product side.