COc1cccc(N2C(=O)NC(=O)/C(=C\c3ccc([N+](=O)[O-])s3)C2=O)c1
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?