CCNC(=O)O[C@@H]1CC[N+]2([O-])CC=C(COC(=O)C(O)(CC)c3ccc(Cl)cc3)C12
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?