CC(=O)N(C(=O)CC(=O)N1N=C(c2ccccc2)C(/N=N/c2ccccc2[N+](=O)[O-])C1=O)c1ccc(Cl)cc1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?