But at the same time, we want to keep the remaining peptide bonds intact. Well, the way that we can do it is we can simply take this molecule here and place it under mildly acidic conditions. And if we place it under mildly acidic conditions, what happens is this peptide bond will hydrolyze, it will break, it will rearrange. So this entire molecule will rearrange to basically form this molecule here. And this is known as PTH amino acid, where in this particular case, because this amino acid is Alanine, then that means this is PTH Alamine. If this amino acid was something else, let's say Glycine, then this would be PTH, glycine and so forth.