Now, the problem with this molecule is the following. The first enzyme that catalyzes step one of beta oxidation, the acyl coenzyme adhdrogenase, cannot actually act on this molecule. Why? Well, recall that acyl coenzyme adhdrogenase basically generates a double bond between carbon two and carbon three. And the problem with this molecule is we already have a double bond between carbon three and carbon four. And so this enzyme cannot generate a double bond between carbon two and carbon three because of the presence of another double bond between carbon three and carbon four.