So we see that ketone bodies inside a target cell can be broken down into acetyl coenzyme a molecules. Now, we see that if we use d three hydroxybutyrate, then not only will we ultimately generate the acetyl coenzyme A, we will also generate NADH inside a target cell. And so the NADH can actually be used by the electron transport chain to generate those ATP molecules. But if we actually use aceto acetoacete, we will not generate the NADH because we bypass this step. We only generate the two acetal coenzyme a molecule. So we see that if the liver forms these d three hydroxybutyrate, then ultimately that target cell will be able to produce more ATP molecules because of this NADH compared to the aceto acetatee, that will not be able to form the NADH inside the target cell.