O=S(=O)(Nc1ncnc2scc(-c3ccc(F)cc3)c12)c1cc(F)ccc1F
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?