Cc1nc(/N=N/c2cc(S(=O)(=O)[O-])c3cc([N+](=O)[O-])cc(S(=O)(=O)[O-])c3c2)c(COP(=O)([O-])[O-])c(C=O)c1O.[Na+].[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?