COC(=O)C1C(=O)C(C(=O)c2ccc([N+](=O)[O-])cc2)C(=O)CC1(C)C
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?