CC(C(=O)OCC(=O)c1cccc([N+](=O)[O-])c1)N1C(=O)C2C3C=CC(C3)C2C1=O
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?