COC(=O)c1[nH]c2ccc(Cl)cc2c1NC(=O)c1ccccc1[N+](=O)[O-]
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?