CC(C)[C@H](NC(=O)N1c2ccccc2NC(=O)[C@@H]1C(C)C)C(=O)N[C@@H](Cc1c[nH]c2ccccc12)C(=O)O
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?