C[n+]1c2n(c3ccccc31)N=C(c1cc(C(C)(C)C)c(O)c(C(C)(C)C)c1)CS2.[Br-]
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?