COc1ccc(C(=O)N(Cc2ccco2)C(C(=O)NC2CCCC2)c2ccc(O)cc2)cc1OC
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?