Cc1nnc2ccc(-c3ccc(NS(=O)(=O)c4ccccc4[N+](=O)[O-])cc3)nn12
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?