COc1ccc(C[C@@H]2c3cc(O)c(OC)cc3CCN2C)cc1O.[O-][Cl+3]([O-])([O-])O
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?