CC1(C)OCC(C2CCC3(C)C4=CCC5C(C)(C)C(O)CCC5(C)C4CCC23C)CC(O)C1O
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?