COc1ccc(NS(=O)(=O)c2cccc(C(=O)NNC(=O)CNC(=O)c3ccccc3Cl)c2)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?