Cc1cc(NS(=O)(=O)c2ccc(NC(=O)c3cc4cc(Br)ccc4oc3=O)cc2)no1
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?