CN1c2ccccc2C(O)=C(C(S)=Nc2ccc(F)c(Cl)c2)S1(=O)=O
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?