So this carbon number two is this carbon shown in this diagram that contains this single electron. Now in the final step, we basically want to regenerate this vitamin B twelve group. And so what happens is one of these h ions along with one of the electrons moves on to form a sigma bond between this carbon and this h atom and we form this succinct coenzyme a. And we regenerate that coenzyme the vitamin B twelve that is used by the methylmelanyl coenzyme A mutate. So ultimately in step three, we transform the methylmalanal coenzyme a into sucl coenzyme A. And once we generate that succil coenzyme A, this can now go into the citric acid cycle to help generate ATP molecules.