Now, we'll see where this molecule comes from in a future lecture. So we basically use this molecule, we kick off this Pyrophosphate molecule and we generate this intermediate. So ultimately this entire blue structure shown here is the sugar component that came from PRPP. And the final step in this process basically kicks off a carbon dioxide. So this carbon dioxide shown here is basically kicked off, it's eliminated. So we have a decarboxylation step that is catalyzed by this decarboxylase enzyme and we form this UMP molecule.