CC1C(=O)OC2C(O)C34C5OC(=O)[C@@]3(OC3OC(=O)[C@H](O)[C@]34C(C(C)(C)C)C5O)[C@]12O
The negative base-10 logarithmic of dissociation constant (pka) for an acid is a direct consequence of the underlying thermodynamics of the dissociation reaction; the pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the pka value of this molecule?