CC(C)C[C@H](NC(=O)c1[nH]cnc1C(=O)NC1CCN(C(=O)OC(C)(C)C)CC1)C(=O)OCc1ccccc1
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?