O=C(COc1ccc2c(c1)oc(=O)c1ccccc12)N[C@@H](Cc1c[nH]c2ccccc12)C(=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?