Cc1ccccc1NC(=O)Cc1nc(COC(=O)CNS(=O)(=O)c2cccc(Br)c2)cs1
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?