Cc1nc(SCC(=O)Nc2ccc(Cl)cc2)c2sc(=S)n(-c3ccccc3)c2n1
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?