O=C(O)C1=CC[C@@H](c2ccc(Cl)cc2)N(S(=O)(=O)c2ccc(Cl)cc2)[C@H]1c1ccc(F)cc1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?