Cc1cc(Cl)cc2c1NC(=O)[C@]21[C@@H]2C(=O)N(Cc3ccccc3)C(=O)[C@@H]2[C@@H]2CCCN21
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?