CC(=O)c1c(-c2ccc(Cl)cc2)c(C#N)c(=S)n(C2OC(CO)C(O)C(O)C2O)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?