O=C(Nc1ccc(Cl)cc1)[C@@H]1[C@@H]2C(=O)N(c3ccc(Cl)cc3Cl)C(=O)[C@@H]2[C@H]2C=CC=NN12
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?