COc1ccc2c3c([nH]c2c1[N+](=O)[O-])C(C)N(Cc1ccc([N+](=O)[O-])cc1)CC3
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?