So we begin with the same molecule. And now we basically label this H atom and this oh group. And we also label this bond here, because what happens is we have a dehydration reaction that is catalyzed by the enolase. 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.