CCOC(=O)c1cc(-c2ccccc2)sc1NC(=O)C(C)N1C(=O)NC(C)(c2ccc(Cl)cc2)C1=O
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?