CCOc1ccc(CCN2C(=O)C(=O)N([C@@H](CC(C)C)CN3CCC[C@@H]3CN3C(=O)C(=O)NC[C@@H]3CC(C)C)C[C@@H]2Cc2ccccc2)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?