And basically these two combine to form a water molecule and this bond breaks off and forms a pi bond between this carbon number two and this carbon number three. And so this is called an enolase because we form an ENL. So if you remember back to organic chemistry, this is in fact an ENL and we call it phosphorinol Pyruvate. So what this dehydration reaction does, and we call it dehydration because the water molecule is lost. What this dehydration reaction does is increases the phosphoryl transfer potential of this molecule. So this molecule has a lower ability to give off asphalt groups than this molecule here.