CCN(CC)C(=O)CSc1nnc(-c2ccc(S(=O)(=O)NCc3ccccc3Cl)cc2)o1
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?