So the PK value of this is 10.9. So in this particular case, because it is ionizable but neither basic nor acidic, what that means is out of these three PKA values, we have to find a middle PKA value. So we have 10.93.1 and eight. So Diaz is our middle PK value. And then we average this value and the PK value for the alpha carboxyl terminal group. So we take 3.1, we added to eight, we get 11.1.