We said that when the sugar molecules exist in their cyclic form, they do not typically undergo any reactions because that aldehyde group or the ketone group is not actually exposed. And so what happens is a special enzyme known as phosphorglucose isomerase opens up this structure to form the open chain, confirmation now that exposes this reactive aldehyde group. In the next step, we basically catalyze the transformation of this glucose in its open chain into a fructose in the open chain. And next we transform the open chain into its closed cyclic chain. And so this is the final product in step number two. This is what we call fructose six phosphate.