COc1cc(C(=O)NCC(=O)N/N=C/c2ccc(-c3ccc([N+](=O)[O-])cc3)o2)cc(OC)c1OC
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?