CCOc1cc(-c2sc(Nc3ccccc3)n[n+]2-c2ccc(F)cc2)ccc1OC.[Cl-]
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?