CCOC(=O)C1=C(CS(=O)(=O)c2ccccc2)NC(=O)NC1c1ccccc1OC
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?