O=C(Nc1ccccc1Cl)c1cc(S(=O)(=O)N2CCCC(C(=O)O)C2)ccc1F
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?