CCOC(=O)C1(C#N)C(c2ccccc2)CC(O)(c2ccc(Cl)cc2)C(C(=O)c2ccc(Cl)cc2)C1c1ccccc1
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?