CCN(CC)S(=O)(=O)c1ccc(O)c(C(=O)OCC(=O)Nc2cc(C)c(C)cc2[N+](=O)[O-])c1
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?