Why? Aldalase well because this is an aldol reaction and in fact going backwards is an aldol condensation. And so that's why we call this an aldolase. So essentially what the aldalase does is it cleans the the bond here and it forms these two, three carbon molecules. So again, the entire point of this step was to basically create the isomer so that once this process takes place, we produce two, three carbon molecules, and not a two carbon and a four carbon molecule. So we have two, three carbon molecules.