COC(=O)c1ccc2c(O)nc(COC(=O)CCC(=O)c3ccc(Cl)cc3)nc2c1
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?