And since we're synthesizing this, the enzyme is known as HMG coenzyme A synthase. So this is once again the rate limiting step of this reaction. And as we'll see in a future lecture, this HMG coenzyme A molecule also appears in the synthesis of cholesterol. So this HMG coenzyme A can also be used to synthesize cholesterol molecules, but in this case, it is used to synthesize ketone bodies. Now, once we generate the HMG coenzyme A, it then reacts in the third step. And this is the first step where we actually form a ketone body.