CC(C)C[C@@H](CC(=O)N[C@@H](CCCN)CC(=O)N[C@@H]1CCCC[C@H]1C(=O)N[C@H](CC(=O)N[C@@H](CCC(=O)O)CC(=O)O)Cc1c[nH]c2ccccc12)NC(=O)[C@@H]1CCCC[C@H]1N
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?