So the entire point of this step is to basically prepare the citrate molecule for oxidative decorboxylation that takes place in step three as well as step four. Now, this double bonded intermediate molecule is known as cisaconitate. And because of this cysticonitate, the enzyme that catalyzes step two is known as aconitase. So once again, once citrate is formed in step one of the citric acid cycle, it must be transformed into its isomeric form, isocitrate. And this reaction, we basically transfer a hydroxyl group from the third carbon onto the adjacent carbon shown here. And what this process does, once again, is it prepares the molecule for a decarboxylation reaction that we'll talk about in the next step.