CCOC(=O)NN(C(=O)OCC)C(C(=O)c1ccccc1)N(NC(=O)OCC)C(=O)OCC
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?