O=S(=O)(c1ccc(F)cc1)N(Cc1ccco1)Cc1cc2ccccc2nc1O
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?