Cc1cc(C)n(-c2nc(SCC(=O)Nc3nccs3)c3c4c(sc3n2)COC(C)(C)C4)n1
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?