C[C@@H](NC(=O)[C@@H]1C[C@]1(C)COC(=O)c1cc([N+](=O)[O-])cc([N+](=O)[O-])c1)c1cccc2ccccc12
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?