Cc1c(C#N)c(O)nc(O)c1N=Nc1ccc(Cl)c(C(=O)O)c1
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?