COc1ccc2cc(C3(C)NC(=O)N(CC(=O)N4CCCCC4)C3=O)ccc2c1
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?