COC(=O)CC1C(C)(C)C(O)C2CC3=C4CC(O)OC(c5ccoc5)[C@]4(C)CCC3[C@@]1(C)C2=O
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 negative pKa value is directly proportional to the standard Gibbs free energy change for the reaction. What is the negative pKa value of this molecule?