Cc1cc(C)c(C)c(S(=O)(=O)N2CCN(CC(=O)Nc3ccc([N+](=O)[O-])cc3)CC2)c1C
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?