What is a compound in the citric acid cycle that has Four carbon atoms?

In the citric acid cycle, the compound with four carbon atoms is succinate. It is formed from the oxidation of succinyl-CoA and is subsequently converted into fumarate through the action of the enzyme succinate dehydrogenase. Succinate plays a key role in the cycle by participating in the regeneration of oxaloacetate, which is essential for the continuation of the cycle.