Cc1ccc(C(=O)N/C(=C/c2cccc([N+](=O)[O-])c2)C(=O)NCC2CCCO2)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?