CC1=C(C(=O)O)N2C(=O)[C@@H](NC(=O)[C@@H](c3ccccc3)N3CSC(=S)N(C(C)C)C3)C2SC1
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?