The second step releases the coenzyme a component to form the citrate molecule as well as this individual coenzyme A. And this is a hydrolysis reaction which we use a water to actually cleave this bond. And so the oxygen essentially attaches itself onto this carbon here to form this group shown here. Now, it's the second step of this overall process that drives the overall equilibrium of this process to the product side so that we can basically form the citrate molecules effectively and efficiently. And that's because the cleavage of this high energy bond is actually a very beneficial process because we don't want to have this high thio esther bond, this high in energy thio ester bond. So in this lecture, I'd like to focus on step one or actually the first process of step one.