Cc1ccc(S(=O)(=O)N2C[C@H]3n4c(=O)ccc(=O)n4C[C@H](OC(=O)Nc4cccs4)[C@@]3(O)C2)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?