So notice this carbon has trigonal planarity and so does this carbon. So because we have this double bond, that means these three bonds will all lie along the same exact plane. And so these two molecules in fact resemble one another much more than this molecule resembles that substrate. And because of that, because this inhibitor resembles the transition state much more than it does that actual substrate molecule, this will be a much more potent, much better inhibitor. In fact, this molecule here, the transition state analog, parole two carboxylic acid binds 160 times more likely to the enzymes active side, to the proline raysimase active side than the proline molecule itself. And so if given a chance, this will be much more likely to bind into the active side than this substrate molecule or this substrate molecule.