CCc1cc(CC(NC(C)=O)C(=O)NCCCCC(=O)NC(C(=O)O)c2c[nH]c3ccccc23)ccc1N(C(=O)C(=O)O)c1ccccc1C(=O)O
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?