COc1ccc(NC(=O)C[S+]([O-])CC(=O)Nc2ccc(-n3cnnn3)c(C)c2)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?