Cc1ccc(C(=O)NC2CCN(CC(=O)Nc3cccc([N+](=O)[O-])c3)CC2)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?