CC(=O)Oc1ccccc1C(=O)C1c2cccc(O)c2C(=O)c2c(O)cccc21
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?