COC(=O)/C(=N/NC(C)(C)C)C(C(=O)OC)C(=O)C(=O)Nc1nc2ccc([N+](=O)[O-])cc2s1
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?