And because the citric acid cycle is literally a cycle, so if we begin with an oxyloacetate. What that means is we have to end up with that same oxyloacetate. And so what this process involves is in these three steps six, seven, eight, we transform the four carbon succinate into the four carbon oxyloacetate. And so the only difference between these two molecules is on this region, we have a methylene group, a ch two component. But on this region of the oxyloacetate, we have a carbonyl component. And so we see that what happens in this three step process is we basically transform the methylene group on the Succinate into the oxyloacetate that contains a carbonyl group.