Cc1cc(Br)ccc1NC(=O)c1cc2c(=O)n(C)c3cc(Cl)ccc3c2s1
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?