CCn1cc([N+](=O)[O-])c(C(=O)Nc2nc(-c3ccc(C)cc3)c(C)s2)n1
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?