CC(=O)c1c(O)cc(O)c(-c2c(C)cc(O)c3c2C(=O)c2cccc(O)c2C3=O)c1O
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?