CCn1nc(NS(=O)(=O)c2ccc([N+](=O)[O-])cc2)c2cc3cccc(C)c3nc21
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?