So what about the five Co enzymes that are used by this protein complex. Well, we have thymine pyrophosphate TPP, which is basically used in step one. And this is actually a prosthetic group that is attached onto pyruvate dehydrogenase, and we'll see what it's used for in just a moment. We also have a derivative of lipoic acid known as lipoamide. And we'll talk about what that does in just a moment. And then we have the coenzyme A, which basically acts as the carrier molecule for the CETL group.