CC(C)N(C(=O)[C@H]1C[C@H](CC(=O)NCc2ccco2)C(=O)N2CCc3c([nH]c4cc(-c5ccco5)ccc34)[C@]12C)C(C)C
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?