And notice in this process, we essentially kick off the I dye and we also break off that H atom. And so we form this molecule, as shown here. The H has a positive charge, the iodide has a negative charge. Now, this is the other example. And in this particular case, we see that di isopropyl phosphoridate actually reacts with serene amino acids. For instance, we know that in the active side of acetylcholinesterase, we have these serine amino acids that catalyze the reactions.