O=C(C1CCN(Cc2cc(Cl)ccc2O)CC1)N1CCN(Cc2ccccc2)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?