COc1cc(C(C2C(=O)CC(C)(C)CC2=O)C2C(=O)CC(C)(C)CC2=O)ccc1OC(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?