C/C=C/C1=C(Cl)C(=O)[C@@H](Cl)[C@@]1(O)C(=O)OC
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?