COc1ccc([N+](=O)[O-])c(OC)c1C(=O)NC(=O)Nc1c(F)c(F)c(F)c(F)c1F
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?