Cc1ccc(-n2c(C)cc(/C(O)=C(/C([S-])=Nc3ccc(F)c(Cl)c3)[n+]3ccccc3)c2C)cc1
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?