CC(NC(=O)[C@H](C)NC(=O)[C@@H]1CSC2c3ccccc3C(=O)N21)c1ccccc1
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?