CN(CCOc1ccccc1)CC(=O)Nc1ccc(Cl)cc1[N+](=O)[O-].O=C(O)C(=O)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?