OC1c2ccccc2[C@@H]2[C@H]1[C@@H](c1ccccc1)C1(Cc3ccccc3C1O)[C@H]2c1ccccc1
An acid's negative base-10 logarithmic dissociation constant (pKa) follows directly from its underlying thermodynamics; the negative pKa is directly proportional to its standard Gibbs free energy change. What is the negative pKa value of this molecule?