Cc1ccc(NC(=O)CSc2nc3nccnc3c(=O)n2CCc2c[nH]c3ccccc23)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?