Cc1cc2[nH]c(=O)c(=O)[nH]c2cc1S(=O)(=O)N1CCN(c2cccc(Cl)c2)CC1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?