O=C(O)CC(NC(=O)C12CC3CC(CC(C3)C1)C2)c1cc([N+](=O)[O-])ccc1Cl
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?