COc1ccc(Cl)cc1NC(=O)C(C)N1CCN(C/C=C/c2ccccc2)CC1.O=C(O)C(=O)O
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?