COc1ccc(C(C2=C(O)CC(C)OC2=O)C2=C(O)CC(C)OC2=O)cc1
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?