Cc1ccc(C)c(N/C([S-])=C(/C(=O)c2ccc(Cl)s2)[n+]2ccccc2)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?