And it activates the fatty acid by ultimately creating a thio ester bond between the sulfur atom on the coenzyme molecule and the carbon atom on that fatty acid. So in a two step process, the enzyme fatty acid thy kinase catalyzed the formation of a thyroid bond between the carboxyl group of the fatty acid and the sulfur group of that coenzyme aid. So let's take a look at this two step process and let's begin with step one. So, in step one, we actually use an ATP molecule. And what this enzyme does is the enzyme catalyze the transfer of an adenosine monophosphate group from the ATP and onto this fatty acid. And that generates an intermediate molecule known as acyl adenylate.