Cc1ccc(S(=O)(=O)CC(=O)Nc2ccc(S(=O)(=O)Nc3onc(C)c3C)cc2)cc1
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?