CS(=O)(=O)c1ccc2nc(NC(=O)c3cc(-c4ccccc4)nn3-c3ccccc3)sc2c1
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?