COC(=O)c1ccc2c(=O)n(CCc3ccc(S(N)(=O)=O)cc3)c(SCC(=O)C(C)(C)C)nc2c1
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?