CSc1nc(N)c2ncn([C@@H]3O[C@@H](COP(=O)([O-])OP(=O)([O-])[O-])[C@@H](O)[C@H]3O)c2n1.[Na+].[Na+].[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?