Cc1ccccc1Nc1sc(C(=O)c2ccccc2)c(N)c1C(=O)NCc1ccc(Cl)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?