O=S(=O)(NCCc1nnc2ccc(SCc3ccc(C(F)(F)F)cc3)nn12)c1ccccc1
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?