Now, this molecule is stable, and it's stable until the second substrate molecule actually enters the reaction. And so we have the second substrate molecule and aldosutran, in this case, we're going to use Glycerial, glyceroaldehyde three phosphate, the same molecule that we use when we discussed the non oxidative phase of the pentose phosphate pathway. So what happens is this same H plus ion that was basically kicked off is now used in this particular reaction. And so what we see happen is these two electrons on the nitrogen basically form a pipeline between this nitrogen, this carbon, and that breaks this pipeline here. And that Pi bond acts as a nucleophile. It basically attacks the carbon, forms a sigma bond between this carbon here and this carbon here.