Cc1ccc2nc(-n3c(/C=C/c4ccccc4O)nc4ccccc4c3=O)sc2c1
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?