Cc1ccc(OCC(=O)Nc2ccc(S(=O)(=O)N(Cc3ccccc3)c3ccccc3)cc2)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?