Cc1ccc(NC(=O)c2cc(S(=O)(=O)Nc3n[nH]c(=O)n3-c3ccccc3)c(S)cc2Cl)cc1
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?