CCOC(=O)c1ccc(N2C(=O)c3[nH]nc(-c4ccco4)c3C2c2cccc(O)c2)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 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?