COC(=O)c1c(C)c2c(c(C)c1O)OC(=O)c1c(C)c(Cl)c(O)c(Cl)c1O2
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?