COc1ccc(CNC(=O)C(c2ccco2)N(Cc2ccccc2)C(=O)Cc2cccs2)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?