COc1ccc(C(=O)Nc2ccccc2C(=O)NC(Cc2ccc(O)cc2)C(=O)NNC(=O)c2ccccc2)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?