COC(=O)c1ccc(-n2c(C)cc(-c3csc(NC(=O)c4ccc(S(=O)(=O)N(C)C)cc4)n3)c2C)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?