CCOc1ccc2nc(SCC(=O)Nc3ccc(S(=O)(=O)N4CCCC4)cc3)c(C)cc2c1
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?