It binds so strongly that it's very unlikely that it's ever going to actually dissociate from that enzyme. So if we take a look in the following chemical reaction, we have the enzyme and our Irreversible inhibitor. And so because this is attracted very strongly to that enzyme, it will bind onto that enzyme, forming this product, this enzyme inhibitor complex. And notice the arrow is much longer going this way than this way. And what that means is the binding is essentially irreversible. The equilibrium lies very far to the right side of this chemical reaction.