CNC1C(O)[C@@H]2OC(O[C@@H]3C(O)C(O)C(N)C[C@H]3N)C(N)C[C@H]2O[C@H]1O[C@@H]1OC(CO)C(N)C(O)C1O
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?