Cc1cccc([N+]2=C3CCCCN3C(O)(c3cccs3)C2)c1C.[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?