Cc1cc([N+](=O)[O-])ccc1N1C(=O)c2ccc(C(=O)Nc3ccccc3C(=O)O)cc2C1=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?