And then these molecules are converted via the reverse non oxidative steps of the pentose phosphate pathway into the ribose five phosphate. Now the correct stoichiometric net equation for this particular reaction is given to us here. So we input five glucose six phosphate molecules and we use up a single ATP molecule and we generate six ribose five phosphate molecules, a single ATP molecule and two H plus ions. So let's discuss why we have a ratio of five to six molecules and where the ATP actually comes from. So we have four glucose phosphate molecules that we convert into four fructose six phosphate molecules. We take the fifth glucose phosphate and we convert it into a fructose six phosphate, but we don't stop there.