CCOc1ccc(/C(C)=N/N2C(=O)C(CC(=O)Nc3ccc(OC)cc3[N+](=O)[O-])S/C2=N\c2cccc(C)c2C)cc1
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?