CC(=O)OC[C@]1(C)[C@H]2C[C@@H](OC(=O)c3ccccc3)[C@@]34CO[C@](C)(C(=O)[C@@]5(O)C[C@H](C)[C@H](OC(C)=O)[C@@H]5[C@H]3OC(C)=O)[C@@H]4[C@H]21
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?