CCOC(=O)C1=C(C)N(C[C@@H]2CC[C@@H](Cc3ccc(-c4ccccc4)cc3)O2)C(=O)NC1c1ccc(Cl)cc1
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?