N#CC(C(=O)/C(=N/NC(=O)c1ccccc1O)C(C#N)c1ccc(Cl)cc1)c1ccc(Cl)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?