CN1C(=O)c2cccc3c(S(=O)(=O)Nc4cccc(C(=O)O)c4)ccc1c23
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?