CC(=O)N1c2ccc(S(=O)(=O)N3CCCC3C(=O)NCc3ccc(Cl)cc3)cc2CC1C
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?