CCOc1ccccc1/C=C1\NC(=O)N(/C=C2\C(=O)Oc3ccccc3C2=O)C1=O
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?