Cc1cc(S(=O)(=O)N/C(=C(\C#N)C(=O)c2ccc(Cl)cc2)[n+]2ccc(N(C)C)cc2)c([S-])cc1Cl
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?