That kicks off this H plus ion, and that forms a pi bond between this oxygen and this carbon. In the process, we break the sigma bond between carbon three and carbon four. And that sigma bond is used to form a pi bond between carbon two and carbon three. And then that actually breaks this pi bond. And those two electrons in the Pi bond end up on this nitrogen, and we form this stable molecule. In the process, we also kick off and we generate the four carbon molecule, the aldos product, in this case, the rethros four phosphate.