C=CCN1C(=O)NC(=O)/C(=C(/C)Nc2ccc(C(=O)OCC)cc2)C1=O
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?