O=C(c1ccccc1)[C@H]1Nc2ccc(Cl)cc2[C@H]2c3ccccc3O[C@@H]12
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?