CC(/C(=N/NC(=O)C(N)=O)c1c(Cl)ccc(Cl)c1O)C1(O)C(=O)Nc2ccccc21
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?