O=C(Nc1cccc(F)c1)N1CC[C@@]2(CCCN(S(=O)(=O)c3ccccc3)C2)C1
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?