O=C(NCCc1ccc(Cl)cc1)c1ccc2c(c1)N(Cc1ccccc1F)C(=O)c1ccccc1S2(=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?