O=C1NC(=O)N(Cc2ccco2)C(=O)/C1=C\c1cccn1CCOc1ccc(Cl)cc1
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?