O=C(CN1C(=O)/C(=C2/SC(=S)N(CCS(=O)(=O)O)C2=O)c2ccccc21)Nc1cccc(C(F)(F)F)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?