Cc1nc(-c2cccc(NC(=O)c3ccc(Cl)c(S(=O)(=O)N4CCCC4)c3)c2)cs1
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?