Now, if it's so endergonic, why does it actually take place? Well, because it produces the NADH molecule that then goes on into the electron transport chain. And when this is oxidized by the proteins of electron transport chain, that process is exergonic. And that process helps drive this process here. In addition, once we form the oxyloacetate, it goes on to carry out step one. And step one is a very exergonic process.