CC(C)NC(=O)C1CCN(C(=O)C(C(=O)c2ccccc2)n2cc(Cl)ccc2=O)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?