This rate constant multiplied by the concentration of the reactant, in this case, that enzyme substrate complex. And let's call this equation number one. Now, if you recall our discussion, our derivation of the of the Michaelis methane equation, we basically used the steady state conditions. So we assumed that the reaction was under steady state conditions. So this reaction was under steady state conditions. And what that basically means is the intermediate concentration, the intermediate being the enzyme substrate complex.