COc1ccccc1[C@@H]1C(c2cccc(Cl)c2)=NN(c2ccccc2)[C@H]1C(=O)N1CCOC1=O
An acid's negative base-10 logarithmic dissociation constant (pka) follows directly from its underlying thermodynamics; pKa is directly proportional to its standard Gibbs free energy change. What is the pka value of this molecule?