CC1=C(C(=O)Nc2ccc(Cl)cc2)C(c2ccc(C(F)(F)F)cc2)n2nnnc2N1
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?