So we take the activated fatty acid and we allow it to undergo an oxidation step. And here, we're essentially extracting electrons. More specifically, we extract an H atom from this carbon, an H atom from this carbon, and electrons left over on these two carbons. We have one electron left over here, one electron left over here that is used to actually generate a pi bond. So going from this molecule to this molecule, we ultimately form a double bond. Now, once we form the double bond, the next step is a hydration step.