COC(=O)[C@@H]1C[C@@]2(O)[C@H](O)[C@H](O)[C@H](O)C[C@H]2N1Cc1ccccc1OS(=O)(=O)c1ccc(C)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 negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?