Cc1oc(-c2ccc(Cl)cc2)nc1C[S+]([O-])CC(=O)NCc1ccccc1
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?