CCCC1OC2CC3C4CCC5=CC(=O)C=CC5(C)C4C(O)CC3(C)[C@]2(C(=O)CO)O1
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?