COc1ccccc1N1CCN(C(CNC(=O)C(=O)NCCc2ccccc2)c2cccnc2)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?