Cc1ccc(-c2cn(-c3ccc(Cl)cc3)c(S(=O)(=O)CC(=O)Nc3ccccc3)n2)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?