CCC(C)C(NC(=O)CNC(=O)C(Cc1ccccc1)NC(=O)C1CCCN1C(=O)c1ccc(-c2ccc(Cl)cc2Cl)o1)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?