CC(C)COc1ccc(C(=O)N/C(=C\c2cccc([N+](=O)[O-])c2)C(=O)OC(C)C)cc1
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?