CCOC(=O)C1C(c2ccc(Cl)cc2)C(=C(O)OCC)C(=Nc2ccccc2)CC1(C)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?