CCOc1ccc(N/C(Cl)=C(Cl)\C(=C(\Nc2ccc(OCC)cc2)n2nnc3ccccc32)[N+](=O)[O-])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?