CC(=O)c1ccc(NC(=O)[C@@]2(CC(=O)O)CC(/C=C/c3ccccc3)=NO2)cc1
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?