And that's what we mean by trigonal planearity. So there is trigonal plane narrative within this molecule. And what that means is so if the H atom is added on the top side, we basically form this Dproline. But if the H atom is added from the bottom side, we're going to form that Lproline. So from the discussion above, if we can somehow build a molecule that is a transition state analog that resembles the structure of this particular molecule, then that means that transition state analog will be a very potent inhibitor of this enzyme. The proline resumes because that transition analog, that transition state analog will be able to accommodate quite easily into the active side of that enzyme.