CN(C)c1ccc(S(=O)(=O)NCC(=O)OCC(=O)Nc2cc(Cl)cc(Cl)c2)cc1[N+](=O)[O-]
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?