CC[C@H]1C/C=C\Cc2ccccc2[C@H](C(=O)C[C@@H](O)CC(C)=O)OC1=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?