O=C1c2ccccc2[C@@H]2C[C@@H](O)[C@H](Nc3ccccc3-c3ccccc3)CCN12
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?