O=C(NNS(=O)(=O)c1c(F)cc(F)c(Cl)c1F)C12CC3CC(CC(C3)C1)C2
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?