Cc1ccc(NCc2nnc(SCC(=O)Nc3ncc(C)s3)n2Cc2ccco2)c(C)c1
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?