COc1ccc(C)cc1Nc1n[n+](-c2ccccc2)c(-c2cc([N+](=O)[O-])cc(OC)c2O)s1.[Cl-]
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 negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?