COc1ccccc1CC(NC(C)=O)C(=O)NC1CCN(C(=O)Nc2ccccc2C)CC1
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?