COS(=O)(=O)[O-].C[n+]1c2ccccc2c(/C=N\NS(=O)(=O)c2ccc(Cl)cc2)c2ccccc21
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?