O=Cc1ccc(OCc2cccc(COc3ccc(/C=N\Nc4ccc([N+](=O)[O-])cc4[N+](=O)[O-])cc3)n2)cc1
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?