Cc1cc(C)cc(NS(=O)(=O)c2ccc3[nH]cc(C(=O)NCc4ccco4)c(=O)c3c2)c1
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?