Cc1cc(O)nc(SCC(=O)Nc2ncc(S(=O)(=O)c3ccc([N+](=O)[O-])cc3)s2)n1
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?