So in the first step, an ATP molecule is used to transfer AMT onto the fatty acid. This releases a Pyrophosphate molecule, which subsequently hydrolyzes into orthophosphate, and this drives the reaction forward. That's why this step here is important. Now, once we form the acoladenolate, it then acts as a reactive molecule in step two. And in step two, this entire fatty acid is actually bound onto the active side of the enzyme. And then a coenzyme molecule comes in and acts as a nucleophile and attacks the carbon.