CC(=O)C1=C(O)C(=O)N(c2ccc(C(=O)O)cc2)C1c1ccccc1
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?