CCOC(=O)c1cc(CC)sc1N1C(=O)CC(Sc2ncccc2C(=O)O)C1=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?