N=C(N)N/N=C/c1oc(-c2ccc(S(=O)(=O)O)o2)c(-c2ccc(S(=O)(=O)O)o2)c1[N+](=O)[O-]
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?