CC[N+]1(C)CCC(=C2c3ccccc3CC(=O)c3sccc32)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 pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?