CCC(Sc1nc2ccsc2c(=O)n1Cc1ccc(C(=O)O)cc1)C(=O)Nc1ccc(C)c(Cl)c1
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?