Now, once we form the carboxy phosphate, what happens is the following. So this same enzyme, carbon oil phosphate synthetase, takes a glutamine molecule and hydrolyze the glutamine. And once we hydrolyze glutamine, we form two things. We form a glutamate and we also form ammonia. And it's this ammonia that is used to basically attach it onto this carboxy phosphate. So we kick off the orthophosphate we attach the amino group onto this carbon to form this carbonic acid.