C=CCN1C(=O)/C(=C\Nc2cccc([N+](=O)[O-])c2)C(=O)N(CCCC)C1=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?