O=S(=O)(Nc1ccc(N2CCOCC2)cc1)c1c(F)cc(F)cc1Br
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?