So we have carbon one, carbon two, carbon three, carbon four that we basically find here. And so the pipeline that is formed between the oxygen here and the carbon here is basically this pipeline here. So this is actually one of the two products that will be formed in this particular transaldolase reaction. 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.