COc1ccc(C2(O)C[N+](c3ccc(C)cc3)=C3CCCCN32)cc1.[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 negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?