COC(=O)c1ccc(C(NC(=O)OCc2ccccc2)/C(=C/[C@@H](C)C(=O)NCc2ccc(-c3ccccc3)cc2)c2cccnc2)cc1
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?