So this exists in the L isomeric form. And in the final step of the citric acid cycle, we actually want to regenerate the oxyloacetate. And so the malade is oxidized into oxyloacetate by the activity of malade dehydrogenase. In the process, we abstract a Hydride ion, so an H ion and two electrons. And so here we use the NAD plus to form the NADH, and the NADH then can be used by the electron transport chain. Now, one thing I want to mention briefly about this step eight is it's actually a very undergone step.