COC(=O)C1=NN(C(=O)c2ccccc2)C(O)(c2ccc([N+](=O)[O-])cc2)C1
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?