Cc1ccc(S(=O)(=O)NCc2ccccc2)cc1C(=O)N(C)CC(=O)Nc1c(Cl)cccc1Cl
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?