C=CCN(c1cc(O)c2c(c(C)cn2S(=O)(=O)c2ccccc2)c1[N+](=O)[O-])S(C)(=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?