CC1=C(C(=O)Nc2cccc([N+](=O)[O-])c2)C2(CCC(C)CC2)OC1=O
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?