CCN1CCN(c2ccc(S(=O)(=O)N3CCOCC3)cc2NC(=O)C(C)Oc2cccc(Cl)c2)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?