Why? Well, as I mentioned earlier, if we have high levels of ammonia that will increase the levels of Glutamine in the body, it will also increase glycine. And so what we want to do is we want to somehow decrease the levels of glycine and glutamine inside our body. And so in a patient with either one of these deficiencies, we can give the patient benzoate and phenyl acetate. Why? Well, because benzoate in the presence of Coenzyme A and ATP will form benzoyl, coenzyme A, and this molecule will react with glycine to form Hippurate.