O=C(COc1ccc(Cl)cc1Cl)NN1C(=O)C2C3C=CC([C@@H]2C1=O)C31CC1
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?