COc1ccc(C(=O)OCC(=O)Nc2cc(C)on2)cc1S(=O)(=O)N1CCOCC1
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?