COC(=O)C(Cc1cccc(O)c1)NC(=O)C(CC(=O)OCc1ccccc1)NC(=O)OCc1ccccc1
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?