Now, this step is an exergonic step, and under physiological cell conditions, it releases about negative 31.4 kilojoules per mole of energy. And this step, as we discussed previously, actually consists of two different steps. The first step is an aldo condensation. The second step is a hydration reaction. But ultimately, we form the citrate molecule from the oxyloacetate and this acetyl coenzyme a. Now, once we form the citrate molecule, it must be transformed into its isomer molecule known as isocitrate.