Cc1ccc(NC(=O)CNCc2ccccc2Cl)cc1S(=O)(=O)N(C)C.O=C(O)C(=O)O
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?