O=C(Nc1cc(F)ccc1F)c1cnn2c(C(F)F)cc(-c3ccccc3)nc12
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?