O=C(Nc1cccc(C(F)(F)F)c1)c1ccccc1NC(=O)C1CCCCC1
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?