CC(OC(=O)c1ccc(Cl)c(S(=O)(=O)N2CCCC2)c1)C(=O)NC1CCCCC1C
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?