CC(C)(C)OC(=O)NN1CC(=O)N2[C@@H](Cc3c([nH]c4ccccc34)C2(C)C)C1=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?