O=C(CCN1C(=O)S/C(=C/c2ccc(F)cc2)C1=O)Nc1ccc(O)c(C(=O)O)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?