Cc1ccc(CN2CC(C(=O)Nc3nnc(SCc4c(Cl)cccc4Cl)s3)CC2=O)cc1
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?