O=C(O)c1ccc(Nc2nc3ccccc3nc2NS(=O)(=O)c2ccc(F)cc2)cc1
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?