So we have this five membered ring. And by the activity of the enzyme histidine ammonia Lice, we essentially catalyze a simple elimination reaction in which this amino group acts as the Levin group. We have a pi bond that is formed between this carbon and this carbon, which basically acts to kick off this group here. And we form this intermediate molecule, Urakinate. So we form a double bond between this carbon and this carbon, eliminating this Ammonium. Now, in the next step, we have a simple hydration step.