Cc1ccc(C(=O)N/C(=C\c2ccc([N+](=O)[O-])cc2)C(=O)NCCc2ccccc2)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?