Cc1nc2sc(C(=O)NCc3ccc(Cl)cc3)c(NC(=O)c3ccccc3)c2c(C)c1C
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?