O=C(NC1(C(F)(F)F)C(=O)Nc2c1c(=O)[nH]c(=O)n2CCc1ccccc1)c1ccc(Cl)cc1Cl
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?