Cc1ccc(S(=O)(=O)c2cnc(SCC(=O)Nc3ccc4c(c3)OCCO4)[nH]c2=O)cc1C
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?