COc1ccc(N2CCN(C(=O)CN3C(=O)NC4(CCCCC4C)C3=O)CC2)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?