Cc1ccccc1C1C2=C(O)c3ccccc3C2=Nc2nn(-c3ccccc3)c(O)c21
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?