The transfer of this acetyl group from the CETO coenzyme ain onto this oxalo acetate, and that forms this citrate molecule. So citrate is actually a conjugate base of citric acid, and that's why we call this the citric acid cycle. Now, this is also an example of a trichrobaxylic acid, and that's why this is sometimes known as the TCA cycle, trichrobic silic acid cycle. 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.