Cc1cnc(NC(=O)C2=C([O-])c3ccccc3S(=O)(=O)N2C)s1.[Na+]
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?