COc1cc(/C=N\NC(=O)c2ccccc2F)ccc1Oc1ccc([N+](=O)[O-])cn1
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?