CC1(C)CC(=O)C(C(c2cc([N+](=O)[O-])ccc2Cl)C2C(=O)CC(C)(C)CC2=O)C(=O)C1
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?