CCOC(=O)c1ccc(NC2=CC(c3ccc(OCC)cc3)N(c3ccc(C(=O)OCC)cc3)C2=O)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?