N=C(N)NS(=O)(=O)c1ccc(NC(=O)c2cccn3c(=O)c4ccccc4nc23)cc1
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?