COc1ccc(-c2sc(Nc3ccccc3)n[n+]2-c2ccc(F)cc2)c(C)c1C.[Cl-]
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?