Cc1cc(Cl)c(S(=O)(=O)Nc2cccc(O)c2)cc1OCC(N)=O
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?