COc1cc(/C=C/C(=O)OCC(=O)N2CC3(C)CC2CC(C)(C)C3)ccc1O
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?