We have orthophosphate and we also have the N carbomoyl aspartates. Now the first question you might be thinking is what's the big deal with this reaction? What is the physiological significance of this reaction inside our body? Well, as it turns out, this reaction is actually the first step in the very long biological synthesis of nitrogenous basis perimedine bases. And the perimedines are actually used to produce the perimedine based nucleotide triphosphates, for instance, the citadine triphosphates or simply CTP. So the ultimate result of this reaction is the production of this CTP molecule.