O=C(NCCc1ccccc1)c1c[nH]c2ccc(S(=O)(=O)Nc3ccc(F)cc3F)cc2c1=O
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?