COc1ccc(NC(=O)c2cccc3c2C(=O)N(CC2CCCO2)C3)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?