Cc1cccc(NS(=O)(=O)c2ccc(NC(=O)CN(c3cc([N+](=O)[O-])ccc3C)S(C)(=O)=O)cc2)c1
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?