So we have a net result of two GTP, six NADH and two Fadh, two molecules that are produced when two of these acetyl coenzyme A molecules are fed into the citric acid cycle. Now the two GTP are basically catalyzed by special enzyme into two ATP molecules. And so those are the two ATP molecules shown here. Now the six NADH because they're produced directly in the matrix of the mitochondria. Each one of these nadhs produces 2.5 ATP molecules and six multiplied by 2.5 gives us 15. Now, recall that when a single fadh two is oxidized by the electron transport chain, it is oxidized by complex two.