Cc1ccc(N(CC(=O)Nc2cc(Cl)ccc2Oc2ccccc2)S(C)(=O)=O)c(C)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?