O=C1CN(C(=O)c2ccccc2C(F)(F)F)C(c2ccccc2)c2cc(F)ccc2N1
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?