So the enzyme that catalyze this step is an isomerase. So we have malleal acetoacetate isomerase, which uses the activity of glutathione to basically form this molecule, the four funeral acetylacetate. And the final step in this reaction, in which we ultimately want to cleave this Sigma bond here by using essentially a water molecule, this is catalyzed by fumarol acetylacetase. And so ultimately, we form a fumerate, because once we cleave this bond, the oxygen essentially attaches onto this carbon and this becomes a ch three. And so we form acetoacetate and fumerate. And now this can be used to form a ketone body, and this can be used to form our glucose.