CC1CCCN(S(=O)(=O)c2ccc(C(=O)Nc3nnc(-c4ccccc4Cl)o3)cc2)C1
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?