O=C(Nc1ccc(F)cc1)C(=O)c1c(O)[nH]c2ccc([N+](=O)[O-])cc12
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?